What would cause temp. gauge to go to hot and heater starts blowing cold then goes back to normal and starts blowin warm again?

Asked by sbell4800 Feb 19, 2015 at 09:50 AM about the 1993 GMC Sierra 1500 K1500 SLE 4WD Extended Cab SB

Question type: Maintenance & Repair

I have replaced the thermostat and it didn't solve the problem

1 Answer

25

water pump could be going bad or the heater core is getting clogged up. when was the last time you flushed out the ccoolant

Your Answer:

CarGurus Experts

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

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Ford F-150
295 Great Deals out of 13,390 listings starting at $3,888
Used GMC Yukon
12 Great Deals out of 927 listings starting at $6,900
Used Dodge RAM 1500
80 listings starting at $2,000

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.