Overheating

Asked by Sep 05, 2019 at 12:12 PM about the 2001 GMC Sierra 1500

Question type: Maintenance & Repair

My 01 GMC Sierra 1500 is overheating. Sometimes
it'll drive for a few minutes before it overheats and
another time it can drive for almost an hour.
Replaced head gaskets , thermostat, temp sensor.
No oil in water/coolant. Heat and AC work. What
could the problem be?

3 Answers

87,795

Nothing you said points to anything specific, but I'd begin with the cooling fan. Is the overheating problem more at high speeds or near idle? Fans work constantly with AC on. Turn on the AC and see if it runs. If it does, you probably just have a defective engine coolant temperature sensor. If not, you might have a blown fuse or relay, defective fan clutch or wiring, bad fan temperature switch, or bad fan motors.

1 people found this helpful.

Ed92626 Would a fuse or relay make the water boil over? The fans work with/without ac on. The truck doesn't overheat while idling only while driving simply around the block. Sometimes it can take a few minutes to start overheating and another time it can take up to an hour. Replaced the head gaskets (both) and temp sensor and thermostat. Fans work fine and waterpump seems to be working fine also

87,795

If you don't know cars, don't speculate at what the problem might be. Have a mechanic find it & fix it. I'll explain overheating. Overheating can be caused by several things. A broken water pump, sticking thermostat, clogged radiator, collapsed hose, bad radiator cap, air in cooling system. Could be a defect in the cooling fan system causing the fan not to operate when needed. There could even be mechanical issues with the engine that cause this. Start by checking coolant flow. Is the top hose hot? if not it's the thermostat. If it is, with radiator cap off see if there is flow. If not, it's the radiator. If flow, purge air from the system (videos on line explain this simple procedure). This covers 90% of overheating problems..... When you had the work done, the mechanic might not have purged air from the cooling system and that simply might be your problem. Have your mechanic diagnose this & fix it.

1 people found this helpful.

Your Answer:

Sierra 1500

Looking for a Used Sierra 1500 in your area?

CarGurus has 9,496 nationwide Sierra 1500 listings starting at $2,500.

Postal Code:

CarGurus Experts

  • #1
    dragonflyoffshore
    Reputation
    7,280
  • #2
    John Saffrahn
    Reputation
    6,200
  • #3
    yetilikesbeer
    Reputation
    5,980
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Chevrolet Silverado 1500
128 Great Deals out of 10,342 listings starting at $4,930
Used Ford F-150
276 Great Deals out of 12,375 listings starting at $4,096
Used GMC Sierra 2500HD
27 Great Deals out of 1,571 listings starting at $3,500
Used Chevrolet Silverado 2500HD
25 Great Deals out of 1,380 listings starting at $3,995
Used Dodge RAM 1500
12 Great Deals out of 317 listings starting at $2,900
Used Toyota Tundra
22 Great Deals out of 1,339 listings starting at $9,988
Used Chevrolet Tahoe
27 Great Deals out of 793 listings starting at $6,871
Used Toyota Tacoma
51 Great Deals out of 2,098 listings starting at $6,200
Used Ford F-250 Super Duty
22 Great Deals out of 906 listings starting at $3,950
Used GMC Yukon
21 Great Deals out of 895 listings starting at $4,395
Used Chevrolet Camaro
39 Great Deals out of 934 listings starting at $7,900

Used Cars for Sale

2020 GMC Sierra 1500 For Sale
4,092 listings starting at $33,688
2019 GMC Sierra 1500 For Sale
4 Great Deals out of 2,871 listings starting at $28,018
2018 GMC Sierra 1500 For Sale
18 Great Deals out of 538 listings starting at $22,777
2017 GMC Sierra 1500 For Sale
20 Great Deals out of 639 listings starting at $21,995
2016 GMC Sierra 1500 For Sale
19 Great Deals out of 285 listings starting at $20,205

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.