truck wont warm up

Asked by Feb 13, 2016 at 10:58 PM about the 1994 GMC Sierra 1500

Question type: Maintenance & Repair

My 1994 v6 gmc 1500 4x4 will not warm up the
gauge barley gets over 100 an it blows cold air i
replaced both coolant sensors an put a new
thermostat in an i even took the fan off to see if it
would get warm an it wont i have tried everything..
thanks for the help in advance

14 Answers


verify the temperature before and after the thermostat - it is possible the gauge is faulty

I just drove it like 4 miles i wanna say an i can get out an grab ahold of all the hoses on the motor

An the truck didnt barely move from 100 when i change the thermostat


if the coolant is full and the temperature is still low then its possible the new tstat is bad - that is the only temp controlling component I the system.

But with no fan it would still get hot shouldn't it


if you have acces to an inferred thermometer check tsat housing temp and make sure the housing gets to operating temperature


without a fan or with a fan if the tstat is stuck open it will not heat up properly


if you find my help useful please hit the "mark helpful" button - thank you

I could touch the manifolds even though


which manifolds?

The exhaust an i tested the tstat an i touched the intake


Do yo have access to a inferred thermometer (electric laser thermometer) you need to physically check the operating temperature of the vehicle - make sure it is warmed up properly - I'm not sure where you live, I live in Arizona so it only takes about 5-8 minutes to warm up a vehicle to operating temperature

Best Answer Mark helpful

I agree with MStamps, gotta be a defective tstat. Take it out and put it in a pan of water on the stove with a thermometer, see when it opens. It may be open now when you pull it.

1 of 1 people found this helpful.

Already did thst

Your Answer

Sierra 1500

Looking for a Used Sierra 1500 in your area?

CarGurus has 59,399 nationwide Sierra 1500 listings starting at $1,980.


GMC Sierra 1500 Experts

  • #1
  • #2
    John Saffrahn
  • #3
    Glenn Clingenpeel
View All

Related Models For Sale

Used Ford F-150
2,535 Great Deals out of 221,934 listings starting at $1,222
Used Dodge Ram 1500
342 Great Deals out of 9,663 listings starting at $800
Used Toyota Tacoma
452 Great Deals out of 41,046 listings starting at $2,600
Used Chevrolet Tahoe
646 Great Deals out of 37,897 listings starting at $695
Used GMC Yukon
378 Great Deals out of 18,667 listings starting at $1,800
Used Chevrolet Camaro
257 Great Deals out of 30,437 listings starting at $4,200
Used Jeep Grand Cherokee
835 Great Deals out of 73,542 listings starting at $950

Used Cars For Sale

2018 GMC Sierra 1500 For Sale
20 Great Deals out of 30,185 listings starting at $22,990
2017 GMC Sierra 1500 For Sale
69 Great Deals out of 5,342 listings starting at $19,900
2016 GMC Sierra 1500 For Sale
84 Great Deals out of 3,146 listings starting at $13,900
2015 GMC Sierra 1500 For Sale
141 Great Deals out of 5,248 listings starting at $13,500
2014 GMC Sierra 1500 For Sale
153 Great Deals out of 3,762 listings starting at $9,995

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.