Heater not working right acting like a vacuum leak

Asked by Guru9931WX Nov 29, 2021 at 10:11 AM about the 1988 GMC Sierra 1500 C1500 Standard Cab SB

Question type: Maintenance & Repair

Heater seems like it has a vacuum leak at idle it starts to
blow cold air but off idle it blows hot but don't have a
vacuum hose to the air box

1 Answer

Your Answer:

Related Questions

  • Heater not working right acting like a vacuum leak 1 Answer

    Heater seems like it has a vacuum leak at idle it starts to blow cold air but off idle it blows hot but don't have a vacuum hose to the air box

    1988 GMC Sierra 1500 C1500 Standard Cab SB

    -

    Maintenance & Repair

  • heater not working 9 Answers

    at first i lost high and low settings on my heater switch, then the whole switch quit working. the climate control module has been replaced. when the switch is turned on you can hear a clicking nois...

    2005 GMC Sierra 1500 SLE 4WD Extended Cab SB

    -

    Maintenance & Repair

  • Right brake light not working 5 Answers

    My 80 GMC right tail not working I've replaced the bulb and replaced the bulb connector also cleaned the ground wire replaced fuse and still nothing. Any helpful suggestion could anyone think abo...

    GMC Sierra 1500

    -

    Maintenance & Repair

  • my heater fan is not working properlt 3 Answers

    The heater fan works at a very low speed. I can't get it to go at a faster speed

    2006 GMC Sierra 1500

    -

    Maintenance & Repair

  • Right Rear Brake not working 1 Answer

    Problem description: Right rear brake not working. I can push the pedal as hard as i can and when in dirt the tire still spins. When jacked up I and push pedal as hard as I can the right tire still ...

    1999 GMC Sierra 1500 SL Standard Cab SB

    -

    Maintenance & Repair

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
323 Great Deals out of 15,226 listings starting at $3,295
Used Dodge Charger
36 Great Deals out of 626 listings starting at $4,888

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.