Jeep antifreeze leak

Asked by Oct 10, 2017 at 06:41 PM about the 2002 Jeep Grand Cherokee Limited 4WD

Question type: Maintenance & Repair

It drips very small amount only a few
times then stops and only seems like it
drips when the car is off and parked .

28 Answers

I think it's coming from where the picture is taken . When I look with flashlight it's not leaking or anything just a few drops it doesn't look like it's coming from anywhere

263,975

Right above that pulley is the water pump. When the bearing starts to fail on the pump , the coolant weeps out of the weep hole, which is on the underside of the pump. Could also be a gasket for the thermostat.

Should I replace the gasket and the water pump ?

160

If it's not coming from the weep hole at the base of the water pump then here is another possible location. The water pump is sealed with a giant "O" ring. As the O ring begins to fail due to compression and heat and time they will just barely begin to leak. This happened on a Jeep Grand Cherokee with the 5.7 in it.Took forever to isolate the condition. The leak was in a very hard place to visually see. But, it would leak only when running and you couldn't notice it since it was so slow. Then when you parked it overnight you would see some antifreeze on the floor in the morning. The antifreeze would leak down the lower radiator hose then fall onto the transmission cooler lines and follow the lines back another foot and then drip down. this would make it hard to find because it was not a freeze plug, or a heater hose. When running you could see a slight foaming come out at the lower passenger edge of the water pump housing. tiny bubbles then a drop. When the water pump was removed you could see the corrosion (white crusty stuff) that had set in on the groove that the O ring was seated into. (Electrolysis) At that point I just replaced the water pump because the engine had 93,000 miles on it anyway. The water pumps are cheap and I didn't want to remove the water pump in another year or so. So check that option out. I bet that's what it is.

1 of 1 people found this helpful.

Ok. Thanks, also would I have to drain my coolant ( it's almost new )

Can I just replace the seal ?

160

Yes you could, but if your going to replace the O RING seal and the water pump is off already then change the pump also. They are really inexpensive. Trust me it would be a time saver for you. Obviously if the O RING is leaking the pump has quite a few miles and years of service on it. Change it out.

1 of 1 people found this helpful.

Thank you but it has 221k miles not trying to put much money in it just keeping it running great I understand what you mean though appreciate you looking out. So replacing the Gasket should fix the small leak ?

160

It should if it's the O RING leaking. The O rings run anywhere from $8-$14 each. Depends on who you purchase from of course,

1 of 1 people found this helpful.

I've been told by a few people getting a new gasket should work the leak is so small I can't even see it dripping while running I have to wait over time with it parked . There's almost no antifreeze missing

160

True. If the leak is that small you won't see it leaking under the vehicle while running. It usually seeps out while parked. When you turn your engine off the water temp temporarily rises as does the internal pressure in the cooling system. This is caused by heat soak. The coolant stops flowing through the radiator when the motor is off. Thus the coolant temp and system pressure rises a bit and there is no air blowing over the blocks surfaces to blow or dissipate the leaking coolant. That is why you see it accumulate in a place on the ground under the vehicle after shut down.

1 of 1 people found this helpful.

Ok thanks. What do u think estimated time for this job is ?

160

Two hours if you have air tools.

Have alot of tools but not air tools ETA without air tools. ?

160

Two and a half hours without air tools.

How much coolant is in the water pump ? I shouldnt need to drain antifreeze at all ? Just what comes out of the pump

Or do I have to drain it all?

160

Drain it all. If you don't your going to loose every bit of coolant that is higher than the water pump. Drain it, save it and reuse it.

1 of 1 people found this helpful.

How can I pull the water pump out it gets stuck

160

Remove the fan shroud. Remove the fan from the water pump. Remove the heater hoses from the water pump. Remove the lower radiator hose. Lift pump out after all bolts are removed from water pump.

Got it , but now it started and I shut it off now it won't start again

160

Sounds like you need to take it to a shop. Apparently this whole thing is above your skill level. Or find someone that possesses the correct knowledge to perform this repair. Better luck. Hope you resolve your issue with your vehicle.

Got it just needed alittle throttle

Also that sounded kind of rude I did the job fine with the skills I have it's my first car

160

Wasn't intended to be rude. Was just a suggestion. Sounded like you needed more guidance than I could offer.

Well I got it done. & No drips as of now so I think it's fixed , thank you for the guidance you could offer.

160

Good man. I knew you could do it. It was a confidence builder for you. You now have more experience under your belt

Thanks man.

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