Heater in my 1992 GMC Sierra doesn't blow hot air.

Asked by nkra Nov 17, 2011 at 04:10 PM about the 1992 GMC Sierra 1500 C1500 SLE Extended Cab LB

Question type: Maintenance & Repair

The heater core is hot, and the doors all work but it will only blow out cold air. What is the problem? Thanks.

3 Answers
8,255

GMCustomerService answered 12 years ago

Hi Nkra, Sorry to hear about your vehicle issues you are having. I did some research and did not find anything. Because I am not a technician, I would suggest that you take your truck into the dealer for a proper diagnosis. Best, Vanessa-GMC Customer Service

3 people found this helpful.
Mark helpful
1,475

Chris answered 12 years ago

CHECK TO ENSURE ALL DUCT WORK IS CONNECTED OR VENT FLAPS R WORKING CORRECTLY, CHECK THE INLET TEMP OF THE CORE AND OUTLET TEMP, IF ONLY INLET SIDE IS HOT AND OTHER COOL YOUR HEATERCORE IS PROBABLY PLUG, IF THIS IS THE CASE REMOVE BOTH LINES AND CAREFULLY BLOW COMPRESSED AIR THROUGHT THE HEATER CORE I SAY CAREFULLY BECAUSE IF THERE IS A BLOCKAGE AND THE CORE IS WEAK YOU CAN OVERPRESSURIZE THE CORE AND CAUSE A LEAK. IF NONE OF THESE SOLUTIONS WORK, YOUR OPTION MAYBE A GARAGE OR DEALER, IT WILL BE EXPENSIVE BUT IF IT CORRECTS YOUR ISSUE THEN ITS MONEY WELL SPENT.

3 people found this helpful.
Mark helpful

Your Answer:

Related Questions

  • Heater in my 1992 GMC Sierra doesn't blow hot air. 3 Answers

    The heater core is hot, and the doors all work but it will only blow out cold air. What is the problem? Thanks.

    1992 GMC Sierra 1500 C1500 SLE Extended Cab LB

    -

    Maintenance & Repair

  • how to fix 1994 gmc sierra heater to blow out hot air 9 Answers

    put new thermostat and the heater is not working

    1994 GMC Sierra 1500 K1500 SL 4WD Standard Cab LB

    -

    Maintenance & Repair

  • 2000 gmc sierra. heater no blowing hot air 11 Answers

    Have a 2000 gmc sierra. Heater not blowing out hot air. Both input and output hoses hot. Can switch temperature gauge and it will blow cooler air . On hot it is just blowing lukewarm air . Putting ...

    2000 GMC Sierra 1500 SL 4WD Standard Cab LB

    -

    Maintenance & Repair

  • 2005 GMC Sierra heater/ac will not blow. Clicking/buzzing in dash 2 Answers

    36,000 miles bought used. First 4x4 service light was on and sometimes 4x4 will not engage. Now heater/ac will not blow at all. I smelled a musty odor before it quit.

    2005 GMC Sierra 1500 SLE Extended Cab LB

    -

    Maintenance & Repair

  • 95 gmc 1500 how to get hot air to blow? 1 Answer

    So i just did my heater core and both hoses. Themostat was done bout a year ago the whole coling systems new...well after i did the heater core i can get heat to blow any ideas?

    1995 GMC Sierra 1500 C1500 SL Standard Cab SB

    -

    Maintenance & Repair

Sierra 1500

Looking for a Used Sierra 1500 in your area?

CarGurus has 6,937 nationwide Sierra 1500 listings starting at $3,975.

Postal Code:

Shortcuts

Search GMC Sierra 1500 Questions

CarGurus Experts

  • #1
    yetilikesbeer
    Reputation
    12,810
  • #2
    dragonflyoffshore
    Reputation
    11,750
  • #3
    John Saffrahn
    Reputation
    11,690
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Ford F-150
313 Great Deals out of 15,059 listings starting at $1,712
Used GMC Yukon
11 Great Deals out of 724 listings starting at $5,998

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.