radiator fan running high

Is the engine hot? If so the fan is doing its job.

no, the temperature is normal

The fans should come on at preset temperature and then cycle off once the fans cool things down a bit. Are the fans coming on and off or do they stay on all the time?

only 50,000 miles on it. also the heater is blowing cold air.

the fan gets loud after about 15 minutes of driving. it has never done this before.

If you have a clutch fan the clutch is probably bad. The heater problem may be a bad thermostat or air in the system.

both symtoms seemed to be linked because they began at the same time.

If the engine is running hot the fan will come on more. Maybe you should service the cooling system.

Is the fan electric? If so it could be a defective pressure switch on the AC compressor.

I have a f- 150 2013. Both cooling fans run all the time after 160 degrees. They changed the water pump. Then the shit started. Before that they never kicked on

I have the same issue. I HAVE to turn my car off to go through drivethrus. Its embarassingly loud, my wife says she can hear me coming. Father in law even commented on it. Didn't do this in the beginning but now that fan runs so hard. Took it to the dealership. They say some wire on the fan burnt out.

I have the same issue as well. I have a 2012 Ford F150 Fx4. There is a fan noise coming from my engine compartment that is really loud. The fan kicks on and off. Also when I am stopped or moving really slow my truck is blowing cold air even though I have the theromstat set on heat. Spectrum_7968 did you ever figure out what was wrong with your truck?

Sams issue. 2013 fx4. Fan running fast and when the heat is on cold air. Started yesterday. Any answers?

I think we have narrowed it down to a coolant leak but we haven’t taken it to the shop to find the leak yet. But we are having to add coolant every week to the truck.

have been having the same problem with 2011 F-150 Platinum. Mechanic said coolant was low. topped off and reset the system. So far so good. Did not identify any leak but will have to keep an eye on it.

I have 2012 F150 XLT just had the same problem start happening. Heater will not blow hot air unless I rev up to 3000 RPM or so at stop light. Goes back to blowing cold air when going in 30-40 MPH traffic. Some loud auxiliary fan is coming on. Will have to check coolant and system. Thanks. I will get back here about this.

Humm Yea added 1 3/4 gallons of 50/50 antifreeze into the plastic coolant reservoir. Heater works, did not hear the loud auxiliary fan on the way to work. BTW I am found out in old school again. The only way to add water/antifreeze now is through the plastic coolant reservoir? OK I guess. Now to find the leak.

I’ve got a 2012 FX4 5.0, with a performance Tune, but the last few days I’ve noticed my coolant temp getting in the 230° range and a fan kicking on. Then today while driving home the temps reached up to 240°, going in tomorrow to get the coolant system check. Hopefully it solves the problem.

Exact thing happening with my 2013 150. Fan kicks on, won’t blow hot when stopped or driving at a low speed. Anyone have a solid answer?

I changed my thermostat and about a week later the cooling fan started coming on intermittently at high speed. This is in 0 deg weather. One post talked about resetting the system. More about that please.

I am having the same issue, the cooling fan comes on and stays on at high speed. I took it to the dealership and had it serviced and they said it was coming on because I was running the defrost. The temperature has been In the 20s all week, but now is a Saturday and it is 70° outside and now my AC does not blow cold air. Any ideas?

The AC High Pressure Switch (Behind RF Headlight On A 2013 F150 Towards Middle)Could Be Bad. Have To Monitor It With A Scanner. Pressure Shot Up To 425psi, when AC Was Shut Off Pressure Would Drop Real Slow, So Fan Would Stay On High Unless You Switched It Off. Ours Was Actually .5 lb. Low Charge. Compressor Is A Little Noisy & Ford Appears To Be Using Expansion Valve Instead Of A Tube. This Thing Seemed To Straighten Up With Just A Charge. So I Guess We Will See!!

@TheJamster1 Have you had any problems since the charge?

I have the problem with my 2013 f150 unhooked the ac switch and fan stoped have check Freon level next hope its a easy fix.

Mine is in the shop now with over 300psi and they don't know why... and my cooling fan runs pretty much all the time. Mines also a 2013 F150

I still have the issue. When I get home I can bleed off the pressure and air from the reservoir. It helps for a while but the fans start kicking on again after a day or 2. I see a lot of posts describing similar issues but never any fixes. Has anyone tracked this down?

They said mine was .7lbs low and recharged mine and it has been fine since Thursday. I did have a coolant leak but got it fixed, i thought that was why my fan was running. Fan still ran so it brought it back in the shop... they are baffeled and don't know why or how the pressure got so high sitting still and with the A/C off

Having the same problem with my 2011 Expedition. Fan starts going on and off, very loud after driving about 10 minutes. Heater blows cold when driving very slow or stopped. Did anyone figure out what the problem is? Please help.

I've heard its because of a coolant or freon leak!

I have read all the posts going back a year here. I have a 2012 F-150 4x4 V8 with 67K miles and live in South Florida where I hardly ever need to use the heat. My fan kicks on into the loud high gear when the temp gauge gets slightly left of center. (There are no numbers on my gauge) The fan speed will not go back to normal speed. I have to turn off the truck and after it cools, it will go back to the normal speed until I start to drive more and the temp gors up. I have driven this truck in S Florida for all of the 67K miles and this has never happened before. I know that because it is so loud that it is unmistakeable. Most of you posters seem to live in areas where you need the heat on a lot. Mine heat has only been on a few times. Has anyone had a resolution yet? Thanks

We are having the same issue with our 2013 F150. The fan runs high when the AC is on and When the AC is off. When the heat is on the fan does not run high. Looking for suggestions that don't involve paying outrageous amounts of money to the dealer mechanic.

what is the right pressure of Freon gas ??,,Sorry

FYI I replaced P. switch no change still fan kicking ..

Just started having this issue with my 2013 f150 plus a whine that reminds me of low power steering fluid

Same thing happened with my 2012 F-150 FX2, fan have been running high these past few days. A friend at work my air filter must be need to replaced and so I did and checked the coolant reservoir and it looks empty then I noticed some fluid leaking at the water pump. Is there anyone knows about any service bulletin regarding this issue?

Same problem here, fan kicks on high and is very loud. I have had water pump replaced once and upper radiator hose replaced. Still is losing water without any sign of a leak. heater blows cold when stopped.2012 f150

I was having the same problem with my 2011 F-150 lariat limited. Nobody seemed to know what was the cause. ( Here's what fixed mine diy) elevate the front of your truck remove radiator cap ( when cool) as well as reservoir cap, add antifreeze to radiator until full, start truck let idle until warm, squeeze radiator hose, add fluid. Repeat for about 15 mins. This will remove and air from the system. Also I charged my account will a stop leak Freon. My AC was good, but from what I have gathered it could be something to do with the pressure in the lines or something, did those two things and have had no problems with any of the issues, it's been a week now. COST WAS $40

Fan started running high in swfl while using air conditioning. Drove to Michigan and with colder, much colder weather fan was running high constantly. Heat is working good incab but the interior air flow keeps shutting Had mechanics check with computer system, nothing wrong. Going to change thermostat and try to get air out of hose. One part was 178 degrees and down the line was only 78 degrees. Hope this will clear up the problem.

Will change ac sensor

I’ve looked at a few of these forums trying to figure out why my radiator fans on my 2013 Ford F-150 (3.5 EcoBoost) have been running on high the past few weeks. The short of it: the expansion valve in the AC system was bad. For the longer story, I noticed that the fans came on high about three weeks ago. Also, to save people the trouble of reading all of this if they’re having coolant (antifreeze) problems: it ended up having to do nothing with the coolant level on mine (so if you know you’re having trouble with that, then this may not be helpful). Anyway, the temperature was warmer than it had been in a while (low to mid 70’s), so I thought it may have just been that. What struck me as odd though is that they were running on high for my entire 15 minute trip, from the time the truck started cold until I finished the trip, with engine temperatures being completely within normal ranges the entire time. I’m not an expert mechanic, but I knew that having the AC on will sometimes make the fans run, so I turned the AC off towards the beginning of the trip, but the fans still ran on high the entire time. The next few times I drove the truck, I noticed the same thing: radiator fans were running high almost immediately after startup. However, I then noticed that if I did not cut the AC on when I first turned the truck on and never turned it on during the trip, the fans would never come on. However, as soon as I cut the AC on, the fans would run on high the rest of the trip even if I turned the AC back off. This would also include if I was running the heat/defroster but had the AC compressor on (as it kicks on automatically with the defroster). If I turned the truck off and turned it back on without running the AC after turning it back on, most times the fans wouldn’t cut back on (although on warmer days they would occasionally still kick back on). I also noticed on a couple warmer days that the AC wasn’t working very well, so thinking it might be low on Freon, I added some, but both problems (the fans running and the AC not being very cold) remained. After doing some internet research, I thought it might have been a bad high-pressure sensor, the one located behind the passenger side headlight on the high pressure line. I also noticed that if the fans were running high, I could unplug the sensor, and the fans would shut off within a few seconds. If I plugged it back in, then the fans would kick back onto high. My understanding for this was that the truck was getting a high pressure reading off of this sensor when it was plugged in. In order to reduce the pressure, the truck would run the fans on high. When the sensor was unplugged, the truck would shut down the AC system as a safety measure, but since the AC system was shut down, the truck had no reason to run the fans anymore, and it turned them off. This also allowed me to rule out it being a stuck relay just causing the fan to run for no reason. Also, if the system (with the sensor plugged in) detected that the pressure was far too high to kick the compressor on anymore, then the compressor wouldn’t come on (the fans would still run) and no cold air would come out (which I noticed on warmer days). Long story short, I changed the high pressure sensor hoping that was the problem. Nope…still had the exact same behavior. Knowing that the sensor was good (and the plug too as it could tell the difference between being unplugged and when it was getting a high reading), I did some more research. I found a couple of videos that were helpful: https://www.youtube.com/watch?v=sOPn8BQB0pw and https://www.youtube.com/watch? v=xBuAQuWezMY. I also bought an AC manifold gauge set in order to be able to read the high and low pressures. When I hooked it up, I saw my high-pressure side going really high (even with the fans on). After cutting the truck off and letting it sit, I saw the two sides not equaling out very quickly. I also talked to a buddy who looked up a TSB that indicated my problem was likely the expansion valve in the AC system. So, that was my diagnosis. I ordered a new expansion valve and put it in, vacuumed out the system, recharged it with the proper amount of Freon, and it works great. Than low speed radiator fan cuts on every now and then (as it’s supposed to) and drops the pressure down when it gets a little high, but the pressure comes right down to where it’s supposed to be (which it wasn’t doing before with the fans even on high). I’m not a mechanic by trade but like to work on stuff in my free time and to save money, so if anyone has anything to add or correct, please feel free. I mainly hope that this helps someone else who has the same problem. I’d also imagine that many other vehicles (besides just F-150’s) would likely have the same problem with their AC system and resultantly the radiator fans running on high (as I’ve seen some forums with the same problems on different vehicles).

2013 f 150 im having the same issue. Its only happening when im sitting at idle. Fans come on high and stay on until i start to move again. New water pump and cooling system recently serviced. No issue with the heat or air. If it wasn't so embarrassingly loud i wouldn't worry about it. Kind of at a loss...

2015 F150 3.5 Ecoboost. Aux Fan coming on 15 seconds after startup intermittant AC. Turned out to be low coolant. I filled and AUX fan still came on. I checked and cleared codes no codes. Reflashed the computer with SCT and the truck starts AC works and no Aux fan. I had it at the dealer for this last summer and they couldn't figure it out.

2014 f-150 raptor. Fan is kicking while ac on, 15sec full speed running very loud then its stop for 30sec then repeat. When ac off the fan is running in high speed at 115 temp for 30sec then stopped, I don't know what's wrong with this car. It's happened when I tuned it with SCT Any solution??

No answer but with all these problems with the fans why no recalls? Mines a 2013 f150 just went over 50k miles and took it to dealer kept my truck for 28 hrs and told me they hadn't figured out the problem. Getting hotter out and fans running high and hot air blowing out of AC i think there should be a recall on all 2000 and over ford vehicles and have them fix the problem.

2013 f150 ecoboost and am having the same issue. Radiator fans run on high anytime the AC is on. They usually kick on within 10-15 seconds of turning the AC on and run about 90% of the time I'm driving. The only way to get the fans to shut down is to either 1) turn the AC off completely or 2) turn the truck off. I live in Houston so it is hot year round, but the fans still should not be running this high all of the time. Took it to the dealership last week and they think a coolant leak was causing the problems. replaced some parts on the turbo that had rusted out. Fans still running on high so coolant didn't seem to have any effect. This seems to be a common issue with 13 ecoboosts, but I know this isn't "normal" because a co-worker has the exact same truck and his radiator fan hardly ever runs on high. Going back to the dealership next week before my warranty runs out.

Just a heads up. My rad fan was coming on and I delayed getting it fixed, the pressure on one side of my a/c was super high. A/C clutch seized, took out the belt and idler and water pump and tore a hole in my front timing cover. (where the idler was mounted) Painful expensive repair, 2012 with 130km’s. You don’t want the bill I got, fix it early.

Following up on my post from last week. Dealership was useless. They said they checked the AC compressor switch and other AC components and said everything looks normal. They said the fans in these model F-150s were designed to kick on high speed in stop and go traffic and idling because of complaints on prior year F-150's AC not being cold enough. I don't buy it. Yes, the fans should run every now and then in hot climates, but saying this is "normal" to me sounds like Ford doesn't want to admit they screwed up the engineering on this. Even if it's normal operation, Ford should let people know what they can do to fix the issue due to the high number of complaints. I'd prefer to hear the engine and turbos on my truck rather than these obnoxious fans. I'm going to have to try and fix it myself since the dealership has been so worthless. Maybe I just have a bad dealership. They were supposed to fix a coolant leak but didn't even both to check or fix the leak at the connection on the outlet of the coolant expansion reservoir that everyone seems to have issues with. Funny enough, last night I installed a 5 star 87 octane performance custom tune, JLT oil separator, and a banks cold air intake on my truck and it seems like that may have cut down on the frequency and length of time that the fans kick on. Gonna keep an eye on it.

JET ENGINE noise on my 2013 F150 FX4. This seems to only happen when the temperature outside is 92 degrees Fahrenheit or above and I'm using my AC. The blower fan or whatever fan is associated with AC kicks into overdrive. This is extremely loud and embarrassing and I'm a little heated when I see people say its normal. I have 2 other friends with 2013 F150's that do not have this problem. If its normal shouldn't theres be doing it too? I plan on checking freon and coolant but I feel it might be a sensor or possibly something else. Any feedback would be appreciated. Thank you!

@LEGENw84itDARY let me know if you figure anything out as I'm having the exact same issues with my 2013 fx4 ecoboost. I live in Texas and the summer temps seem to be causing the fans to run on overdrive the majority of the time. Friend has a 2013 lariat ecoboost and their fans hardly ever go into overdrive so it is definitely not "normal" operations. I have not checked any sensors yet and am considering taking it to a mechanic as a last resort. I'd avoid the dealerships because from my experience, they'll just tell you it's normal. I installed a custom tune on my truck and that seems to have decrease the frequency and duration of the fans going into overdrive, however they're still doing it pretty frequently. The 2013 ecoboost has quite a few known issues that Ford really dropped the ball on, this one included.

I have exact problem with my 2012 F150 I live in Maine with cool summers. Found faulty AC Pressure Transducer Advance Auto Parts # 37340. $59. Easy install. The faulty part was giving computer a false high pressure reading even with AC off. Like over 720 psi, which I am told is not possible, so replace faulty part. Cheap and easy fix.

Similar problem with my 2013 F-150 V8. (75,000 miles). My water pump failed last winter and was replaced. I never had any problems before this. (I bought the truck brand new). Since then, the radiator "turbo fans" kick in at random. They never did this before the water pump failure-only in hot weather, which is what they're supposed to do. I've had several mechanics look at the truck, including the dealer. I've now spent over $5,000.00 and the problem still persists. What happened to "Ford Tough"??

My truck had the following symptoms due to a leaky water pump (more about that below): - Engine overheating at highway speeds - Engine getting hot at neighborhood speeds - Engine fan running at highest possible speed from engine start to engine stop (in 55F weather...) - Heater ventilation running cold - The ventilation system made a "gurgling" or "rattling" sound before overheating As explained to me over the phone, the water pump has a weep hole that begins emitting coolant when the pump bearings are at the end of their service life. This sounds like a pretty terrible way to notify the driver, but what to I know, I'm just a professional engineer.

Has anyone found a solution beyond the AC Pressure Transducer that Dan replaced? I have a 2013 F150 5 liter. Have recently replaced the water pump (shaft broke so had to) and the thermostat. Also had the cooling system serviced. They've bled the lines to make sure there is no air in there. After the transducer was replaced, based on reading this post, an AC shop cleared the error code in the system. Have also tried to clear/reset the adaptive memory. Seemed like the fan did not kick on high with the loud jet engine noise for about two days, but it is back now and even occurs when the AC is not on. Only time the engine has gotten hot was when the water pump broke (fan was kicking on for a few months before that). It typically runs at normal temps. The mechanic I typically go to has gone through everything and is befuddled. My brother has worked on it and a trusted AC shop has worked on it. Can't seem to find the reason for the fan kicking on and being so loud.

I'm having same thing with a 2011 with 5 litre. Mechanic checked codes and nothing showed. He suggested it was the air conditioning. Lately it has been cool here 5-8 Celceius. Sometimes the fane will come on high before the water temp gauge reaches operating temp and I have not used A/C for a month. Temp sensor? Relay?

My 2011 F-150 overheated, I took it to a reputable service center with ACE certified mechanics, they fixed the overheating problem but the fans sounded like a jet engine remaining on most of the time. I took it back a few days later, they troubleshooted and said my computers weren't talking and that I needed to take it to the dealer. I did. It was at the dealer for a day and they said that the fans were cooling to temperature, but the noise continued. They couldn't find any problems. I just dealt with the super loud nearly constant jet engine (without matching power output) for about six months. A few times when at the gas pump and topping off the tank I noticed that the engine increasingly didn't want to start. I did my research online, youtube mostly, and found that the canister purge valve was the likely culprit and it was. I got the part in this morning, changed it myself and I'm not a mechanic, and the idling went down instantly and the jet engine hasn't returned all day. Looks like it was that simple. Not saying this is your issue, but certainly worth a check.

I just experienced the same heat loss/cold air blowing scenario and took it to Ford. I have a 14 F- 150 King Ranch with 95k for mileage. Also have been experiencing the annoying loud fan noise under the hood. Ford told me that I was losing heat because I was losing coolant through the eco boost turbos. Solution according to Ford is to replace the turbos at a coat of 3K. Anyone with answers will be appreciated.

I have a 2012 F150 with a 5.0 engine. At 100k miles I flushed the cooling system and replaced the thermostat. After that, I noticed my fans would run really high at random times. I replaced the AC pressure sensor as I read on a few posts but that did not help. I thought about it and the only other change was the thermostat I bought from Autozone. I replaced it again with a Motorcraft and so far so good. Don't know how or why but it seems to be doing good now.

Hey guys , i own a 2017 f150 with a 2.7 ecoboost engine and nothing but trouble since day 1 After 2 months of buying, the heater quit, and we live in mid ONT CA and we were in Feb. Brought into dealer and they said there was a faulty switch somewhere in the dash. Had it fixed under warranty and a week later same problem occured . This time it was a Sat. afternoon and dealership was closed. It was minus ten celsius and were 1 hour from home. My wife has a few health issues and that same night we were at the emergency department where they gave her some antibiotics to calm her broncitus (excuse the spelling ) flare up because of over exposure to the cold. On Mon. morning i was at the dealership first thing and I tore a strip of the service department. The one gentlemen asked me if forgot to turn the heater switch on with a grin and headed for the counter where he backed away and said sorry , I was only joking. I replied , its no joke when it concerns my wifes health so fix it. He headed out the door to check it out and returned a few minutes later and said I have set up the heater switches manually under the dash so please don,t touch them at all until I can book your truck in to find the problem.We had to wait for a week for repairs.(Sorry guys, I know its a long story but I am leading up to the current problem. ) When they were done with this last repair I was informed that another switch attached to the first one also failed. This is where it gets better. Another week goes by and once again heater failure. Now my wife is fuming and when we walk through the dealer doors and up to the service desk, she throws the keys at the same service guy and he catches them and says , whats wrong now. She says guess what no heat again, I want the heater fixed right or replaced and I am not waiting for two weeks. This has been B.S. since day one, no more screwing around, fix it. Truck went in the next day and it took a few days to fix because they replaced the whole heater unit. Since then we have been on a recall list until recently to fix a door lock problem that would not allow the lock doors including the tailgate to unlock during cold conditions.Reason given,(aluminum truck does not like the cold and attracked the frost to door switches.) While repairing door locks they had another recall to repair the recoil system on seat belts at the floor because if their is a serious accident the recoils could activate at a high speed causes the floor carpet to ignite. Now gentlemen ,the final straw to date , my dual fans and heater have been working fine until a few weeks ago. Same problem with the high speed issues but only when we have the heater on (not the A.C.) Once again back to dealer . Female service attendent and shop tech. were at my truck with hood open and they could not hear each other talking. No codes were present with tech. equipment so once truck was booked in. Truck was brought in the following week first thing in morn. THREE techs. worked on it and after 4 hours no results. I inquired if they took it for a drive to warm it up and they said no. They did one more test on it , which had something to do with the A.C.and said all was fine. I used truck on friday and was good. Wfe used it on Sat. and same problem with fans. I used it on Sunday and after about an hour on went the fans at high speed. I do not know if they replaced the expansion valve in A.C. unit but I am fit to be tied. This is Nov. 5--2018 and I will be warming up my truck around 7 a.m. and as soon as my fans kick into high gear its to the dealership where the service person and the so called service techs will be called out to have a close up listen to my jet engines Thank you guys for listening and remember that all these problems are on a 2017 f150.

Just something for you all to check...not saying it's the answer... Check out fuse #27 under the hood. Had another issue (will explain at the bottom) and one solution we found was to check fuse #27. Pulled that and, while it wasn't blown, it was toasty on one end. Replaced it and it fixed the issue I was having. This was last night. However, the fan hasn't kicked in at all today, which is unusual. It is about 10 degrees colder today than it has been so far - 43 degrees - but the fan was kicking in when it was 53 degrees last week. I even left it running the entire hour I was sitting at the soccer field...fan never kicked on. I realize this might not be the fix and I also realize this could be symptomatic of another problem, but just thought I would share. (Problem experienced last night) - Got home and turned the truck off. We were home about 45 minutes before we had to go to the next event of the day. Truck had been running fine that day. Went to start it and it wouldn't catch. It would turn over and just keep turning over but didn't catch. Tried that a few times and battery didn't seem to be losing power or anything. Grabbed the work car to get the kid where she needed to be while my brother-in-law looked on here and Ford Forum and found the recommendation of changing out fuse #27. I'll post an update late next week sometime, once it's warmed up into the 50's and 60's, and let you know if the fan kicks in or if there are just more problems. Good luck!

This fan problem just showed up in my 2012 F150. Turns out the radiator fluid level in the reservoir was very low. Some 50/50 antifreeze poured into the reservoir fixed the problem.

Update...3 days of 50-60 degree weather and driving the truck a lot. Used the AC. Also sat in drive thru line at Chick-fil-a...on a Saturday! No jet engine noise. YAY!!! Not saying this is the issue everyone is experiencing but we had done almost all of the other things recommended with no luck. Check fuse #27. It's an easy fix if that turns out to be what it is. Good luck!

2013 Ford F-150 V8 with the same "turbo fan" problem. Problem started ONLY AFTER my water pump went out and was replaced. Sent it to the dealer and they virtually changed out buy entire AC system for around $2,500. NO FIX. I replaced the AC Pressure Switch. NO FIX. I checked and replaced fuse #27. NO FIX. I'm taking it to an independent mechanic next week to replace my year old thermostat with a new one and see if that's the problem. (That solution was offered by a mechanic I spoke with over the phone). I'll update when that's done.

I recently had a problem where the fans were running on high after replacing the water pump and thermostat on a 2013 5.0 F150. Fixed the problem by replacing the Autozone thermostat with an OEM one. Problem went away once I installed the OEM thermostat. Try this before any other expensive repairs! The non OEM thermostats must open at the wrong coolant temperature.

My 2013 F150 2WD 5L V8 had fun symptom. Summer time didn't give it a ton of thought... Fall came vehicle blew cold air. Local Mechanic diagnosed thermostat. changed part same result...went to internet. Suggestion AC/Heater Blend Door Actuator. Doable DIY but not super easy. part sits behind radio so front control panel removal required. Only two screws but one you have to through glove box to secure... plenty of help on internet (try wikihow) Bottom line $25 part (purchase techsmart not dorman) Both problems solved...

From two weeks ago: 2013 Ford F-150 V8 with the same "turbo fan" problem. Problem started ONLY AFTER my water pump went out and was replaced. Sent it to the dealer and they virtually changed out buy entire AC system for around $2,500. NO FIX. I replaced the AC Pressure Switch. NO FIX. I checked and replaced fuse #27. NO FIX. I'm taking it to an independent mechanic next week to replace my year old thermostat with a new one and see if that's the problem. (That solution was offered by a mechanic I spoke with over the phone). I'll update when that's done. UPDATE: Looks like replacing my thermostat with a genuine Motocraft thermostat did the trick. Go figure.

Replaced switch - still running at high speed Replaced fuse - still running at high speed @twford, what did your guy come up with and it is fixed?

I have a 2014 5.0 just hit 96,000 miles this is the second time my truck has had the same problem probably a year ago my heater stopped working changed thermostat fixed it. And the second time (a year later) I noticed the fans kicked on a lot loud too wouldn’t ever hardly cut off I just let it be being that my truck is tuned I figured the tuner had adjusted the temp for them to cut on the about 2 weeks later my heater stoped working same day I also noticed my temp gauge go alittle past half for awhile and then come done then it would do it again and come back down again went and got a new thermostat changed it and it fixed it again and also the fans don’t turn on as much so my opinion is to first check your levels and see if you need to just add coolant that may work if not change the thermostat before taking it in

Fan cluth problem

thanks to your guys help with areas that were tested. I found that the a/c system had a low charge but the a/c clutch was still working. recharged system and fans started to work normally.

I had the exact same problem. 2013 FX4. 3 low cost fixes. #1: check fuse #27. #2 replace the AC switch (autozone has it for $25). #3 replace the AC expansion valve. I ordered the part for $35, and had a mechanic install, vacuum and recharge the system and that fixed it for me

Had the same issue 2 years ago. Replaced the A/C Expansion valve and that fixed it. it started up again recently, however this time the fan comes on all the time whether or not the A/C is on. I'm also getting really bad gas mileage now. I'm thinking its the thermostat stuck open. My haynes manual says that if you run the truck without a thermostat it confuses the computer and screws up the fuel/air mixture. I ordered one and will be changing it out this weekend. I'll let you know how it goes.

I just figured out what was causing my 2012 F150 FX2 Ecoboost 3.5L High Fan to run. My issue was that the low fan was not coming on so the high fan was supplementing for it. So, check your Fan Relay (Low Fan) (mine is relay #85) in the fuse box to see if it is bad. As soon as I pulled mine out and compared it to the Fan Relay (High Fan) (mine is relay #5), I could tell it was probably the issue as the low fan relay was very hot compared to the high fan relay feeling cool to the touch. I swapped the low fan (#85) relay with one I wasn't using, until I can get a replacement, and all is back to normal. I hope this helps someone.

My 2013 F150 just started with the same problem, cooling fan running all the time, temp gauge follows trotle and cabun heater does not work. Checked the coollant level and it was dry, added 1 1/2 gallons, all works normal again. Could not see any leaks, but there is a lot of snow outthere, will keep an eye on it. Very usufull tips on this fourm.'Thanks

I over charged my A C and started having the fans running loud so blead some pressure off the A C and it Quit the noise and still gets cold.

I fixed the problem of loud engine fan+ transmission slip+ high idle RPM~850rpm in the summer when AC is on in my 2000 expedition while temp gauge is right at the middle. I found a coolant leak, so I replaced with a heavy duty radiator. I also replace the fan clutch with original motocraft part, $90.00, and a good quality serpentine belt. I drove today with the AC on for 1hr in stop and go. The engine is extremely quiet. The idle RPM is at 650, and the expedition is responsive on gas pedal with extra power. I believe the problem was the fan clutch that I bought for $35 a few years ago. Since I am lazzy, so I replaced all three parts at the same time to save time. It looks like the fuel indicator drops less for the same commute trip today.

Too much freon pressure causes the fans to run wide open...

2013 Ford F150 V8, radiator fan began running on loud high today. Mileage is 9,700 (yes, only 9,700) Only happens when a/c switch is on, even if you set temp to full hot and blow hot air instead of cold. I'll replace fuse #27 as suggested and hope for the best.

Recently replaced water pump and themostat in my 2013 f150 5.0. Just started having a similar issue with the fan running on high constantly even though its only in the 40s here. My lower radiator hose I noticed was not getting warm even while idling. Ended up putting the old thermostat back in and now it runs fine. For future replacements I would stick with OEM like others have suggested is that seem to fix the problem.

How did you replace the AC pressure sensor, does it just unscrew from the Schrader Valve?

Hey guys, I have 2014 STX 5L with 70k miles on it. About two weeks ago I started noticing the fan running wide open and around the same time I noticed that my heat was only working when the truck was running at speeds. I just spent the last hour reading through this thread. So far based on what I’ve read the quickest things to check were as follows. 1. Coolant level. 2. Fuse#27. When I looked both my coolant level was low and fuse 27 was toasty just as described. I immediately changed fuse 27 so far about 30 mins in and there is no high fan noise. My manual says Fuse#27 is a fuel pump relay however this can’t be right in my opinion. I think the low to no heat issue at idle can easily be explained by the low coolant level. Your heat comes from the coolant fluid running through your system when the truck is running Omar speeds your system is charged with pressure and you can get the heat exchange, at low speeds/idle you may not have enough pressure in the system to pull heat. I’m about to get fluid and top off the system so we will see what happens with that. So far I’m of the opinion that both issues may be unrelated. I’ll update later when I’ve had more time to asses the repairs done so far.

Had the water pump and thermostat replaced on my Ford F-150 EcoBoost. ever since having it replaced, cooling fans have sounded like they are on turbo every time the engine temperature gets to normal. Had my mechanic switch out my new thermostat with another thermostat except this time used a OEM part from Ford. Problem solved. Not sure why it works but it does.

Same for me...Own a 2013 Ford F150 and had water pump and thermostat replaced over the holidays. Fan started running high after 10 minutes of driving. Took to another shop, said it was "normal" grrrr. Took to Ford dealer, couldn't find any problem. Read this forum and went and bought the Motorcraft thermostat and had mechanic install, problem solved. (Previous thermostat was a NAPA that was supposedly rated same as the OEM) - Would have had that mechanic swap it out but we were out of town when pump broke. THANKS TO ALL WHO WROTE IN!!! It's a shame, FORD mechanics don't know this and nobody bothers to research it!

Thank u everyone for the tips I have A Ford F150 with the same problems of changing water pump and thermostat out then hi fans the fix was the thermostat hand to go to ford Dealership to get the same exact thermostat that Was in it fix

2013 F-150 Platinum; I had the issue with my coolant going low. I had a small hose or tube somewhere that was cracked and leaking on my power steering harness. My power steering would randomly go out! That was fixed after multiple trips to the dealership. Now, I have the fans staying on after I put on the compressor for the defrost. I'm guessing that it's the A/C pressure switch. Fix Or Repair Daily!

Gas probe is inside gas tank, it is cooled by having gas level at least 1/4-1/2 tank full always. Probe runs very hot. I didn’t have a problem with high fan until gas tank was almost empty, about 90 miles or less on dash board. Check fuses no problem, coolant full? , 2017, F150, 21K miles, filled gas tank seems to be running fine, no loud fan noise.

I have a 2013 f150 fx4 as soon as I start my truck the fans kick on and wont shut off until I shut the truck off what is causing this to happen I don't have anything on the heat is off what can cause this

Unplugged the A/C pressure switch by the battery, and it stopped. Confirmed A/C refrigerant was empty. Charged system after confirming low, and now ok. Need to locate refrigerant leak now but otherwise ok.

I have a 2012 F150 with a 5.0 engine. At 150k miles I change the water pump and replaced the thermostat. After that, I noticed my fans would run really high with the ac on. I thought about it and the only other change was the thermostat I bought one from the local parts house. I replaced the thermostat with a Motorcraft and all good.

If the heater is blowing cold. U prolly have a low coolant issue.

Thanks to all for your suggestions. It appears my problem of the high speed fan engaging and running continuously when the 2013 Ford F-150 5.0 Liter is solved. The answer was installing a Ford, Motorcraft thermostat. My water pump had gone bad so I decided to change the thermostat at the same time as neither had ever been serviced. I went back with 2 different temperature thermostats I purchased from O'Reilly's. Neither solved the problem, however the Motorcraft Ford thermostat did.

I have a 2010 F150 4.6 L and my AC clutch will not Engage. I replaced the low pressure switch and still no AC. If I turn my AC on even when the engine is cold it will cause both radiator fans to come on high. Extremely Loud. The only way to make them stop running is to disconnect my battery. Once I reconnect my battery The fans will not come on until I turn my AC back on and then I have the same problem.

My fan 2013 F-150 would come on super high and loud after 15 min of driving, then would not go off. Also noticed the temp gauge was moving barely up and down. Switched out the thermostat (which was after market) to Motorcraft, fixed the problem right away. Part was $20 and Ford Dealership.

2015 3.5 EcoBoost. Fans were engaging 110% at start up, no a/c cooling. Still had coolant at very high pressure when I evacuated the lines. Replaced A/c expansion valve located on passenger side firewall. Problem was okay for about 35k miles. Now it’s doing it again. So I’m about to again put a shitty part that still needs a recall back in a truck that apart from the dual climate and this jet engine fan problem has been a champion. Oh well.

This is just my personal experience, I have 2017 f150 Eco-boost and a week ago my fan started blowing on high, even when the keys off, I’ve been unplugging the battery cable, and I’ve been on this site reading some answers and questions, so I got my owners manual looked up the motor blower fuse, and started pulling a couple out and putting them back in, Then I got to the number 104 fuse, pulled it out and it stopped, this is great news, I’m not saying I fixed it, but I fixed it for now and wanted to share my good news, I actually turn the key on and started the vehicle and turned it back off and it still didn’t come on like it has been, thank you to the site thank you to the people that are posting I really appreciate it, but pulling the 104 fuse, and putting it back in is what did it for me, for now, I hope I didn’t take anyone’s time up, I hope this was helpful for someone, I know I’m really happy right now, so if it happens again I’ll let you know, and I’ll tell you when I did thanks for your time

Here is my story about my 2013 F150 high speed fan running all the time. I purchased the truck brand new in 2013 with the XLT trim and V8. This has been a great truck used primarily for skiing, hunting, and towing a boat. At about 60k miles the high-speed fan started running more than needed. As time went on it continued to run and increased in frequency. It would run in all conditions, cold, hot, towing, idling, with the heater on or off and with the air conditioner on or off. I took the truck to my dealer and the service check in guy was a prick. The fan was so loud that I had to turn the truck off so we could talk. He then told me that this was normal. Obviously, I argued but he continued his attitude, so I left. I then did a ton of research on many forums including this one. Based on the recommendations I replaced the fan relay switches, no luck. I took it to my trusted mechanic who replaced the freon and checked for leaks. No luck. He then flushed the radiator and the fan continued to run. I love this truck but could not stand the noise anymore. I decided to look into trading it in for a Dodge Rebel and took it back to the same dealer to get the recall, unrelated to the fan noise, fixed. At the check in the same prick was not around so I decided to explain the issue one more time. This service guy was great. He told me that he was sure they can figure it out. They kept the truck overnight and pressure tested the radiator system and found no leaks. They called me and told me they felt the problem was the lack of coolant movement even though the water pump tested normal. They said that it was likely that one of the internal parts of the pump was not working like it should. Full disclosure I am not very mechanically inclined, brakes and plugs are about my limit. I decided to roll the dice and have the pump replaced as well as the thermostat. I still cannot believe it, but the high-speed fan is not kicking on like it was!!!! I have driven it a couple hundred miles including into the Colorado high country without any crazy fan noise!! I have not towed with it yet and will update this when I do! I hope this helps!!

cylinder head temp sensor pass side back of head