Coolant gauge
10

Asked by campjl57 Feb 10, 2016 at 06:45 AM about the 1990 GMC Sierra 1500 K1500 4WD Standard Cab LB

Question type: Maintenance & Repair

I have a 1990 GMC Sierra k1500, I've  
recently been having fluctuating reading on
my coolant dashboard sensors going from
normal up to 260 and back down, it
constantly does this as I drive. I have
changed out both coolant temperate
sensors and my thermometer (I did not use
a  torque wrench but don't see that being
the problem, though I may stand corrected)
I don't know what else to do to fix this
problem. I believe the engine it self if
staying at a normal temperature, I don't
know for sure, but I am puzzled by these
reading. Thank you for your help.

3 Answers
188,395

Paul answered 8 years ago

To see if the temperature is correct they sell a cap that will tell you what the temperature is you may what to try to make sure you temp is ok. https://store.schnitzracing.com/schnitz-high-pressure-temperature-gauge-radiator-cap/?gclid=CNyKyseV7coCFcFZhgod1JIOrQ

1 people found this helpful.
Mark helpful
221,015

Rowefast answered 8 years ago

Ya but still need to check things out. Hard to say from back here, but to be safe, I would change out the thermostat and the temperature sending unit. Also make sure the cooling system is purged from air pockets when refilling.

Mark helpful

alwyswrkin answered 4 years ago

I had the same problem on my 1990 GMC Sierra 1500 5.7lt. 2wd stepside. Did the same, changed everything. Ended up being a short in the wire at the firewall.it had worn through the insulation over the year's.

Mark helpful

Your Answer:

Related Questions

  • Coolant gauge 3 Answers

    I have a 1990 GMC Sierra k1500, I've recently been having fluctuating reading on my coolant dashboard sensors going from normal up to 260 and back down, it constantly does this as I drive. I have...

    1990 GMC Sierra 1500 K1500 4WD Standard Cab LB

    -

    Maintenance & Repair

  • Fuel gauge 1 Answer

    My trucks gas gauge won’t work when it’s rainy but works fine when dry

    2008 GMC Sierra 1500 SLE2 Crew Cab

    -

    Maintenance & Repair

  • Crazy Gas Gauge 3 Answers

    The gas gauge in my 2001 GMC Sierra has started to go a bit crazy. It bounces all over the place when I get below a 1/4 tank. I replaced the fuel pump at several hundred dollars. Any other ideas?

    2001 GMC Sierra 1500

    -

    Maintenance & Repair

  • Coolant gauge not working 1 Answer

    My car was running fine, I went into gas station and tried to start car the car finally started and the check gauges light came on , the coolant gauge did not move even when it warmed up, checked...

    2005 GMC Envoy 4 Dr Denali 4WD SUV

    -

    Maintenance & Repair

  • When empty do I fill the coolant resivoir with coolant? 2 Answers

    Had an oil/lube done yesterday and told it was empty (not radiator, just reservoir) - Kwik Kar Lube did not have coolant to put in so will do it myself but need to be sure I am doing the correct thing...

    1999 GMC Sierra 1500 SLE Extended Cab LB

    -

    Maintenance & Repair

Sierra 1500

Looking for a Used Sierra 1500 in your area?

CarGurus has 66,222 nationwide Sierra 1500 listings starting at $875.

ZIP:

Own this car?

Share your experience with others.

1990 GMC Sierra 1500

Write a car review

Review another car

Shortcuts

Search GMC Sierra 1500 Questions

CarGurus Experts

  • #1
    yetilikesbeer
    Reputation
    12,350
  • #2
    dragonflyoffshore
    Reputation
    11,510
  • #3
    John Saffrahn
    Reputation
    11,450
View All

Know more, shop wisely

Search

Related Models For Sale

Used Ford F-150
6,091 Great Deals out of 133,226 listings starting at $1,100

Used Cars for Sale

2024 GMC Sierra 1500 For Sale
93 Great Deals out of 43,929 listings starting at $28,505
2023 GMC Sierra 1500 For Sale
275 Great Deals out of 4,646 listings starting at $31,987
2022 GMC Sierra 1500 For Sale
192 Great Deals out of 1,695 listings starting at $28,410
2021 GMC Sierra 1500 For Sale
316 Great Deals out of 4,026 listings starting at $19,000
2020 GMC Sierra 1500 For Sale
175 Great Deals out of 2,399 listings starting at $17,990

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.