2004 Pontiac Grand Prix only blowing cold air when heater is on

Asked by dawn Mar 24, 2019 at 03:46 PM about the 2004 Pontiac Grand Prix GT1

Question type: Maintenance & Repair

I have a 2004 Pontiac grand prix , I blew a head gasket and had it repaired.
Since then the heater was only blowing slightly hot air and now it only blows
cold air. The coolant level id good and the car temp never goes over the half
way point. Any suggestions?

4 Answers
30

Dave answered 5 years ago

Flush the heater core out. Did you try radiator stop leak prior to getting the gasket fixed? It's probably plugged. Make sure it is bled properly as well, I usually pop off one of the hoses coming from the engine to the core just to verify coolant is circulating through it. And to bleed the air from the system.

1 people found this helpful.
Mark helpful

dawn answered 5 years ago

The mechanic I went to already did a full flush and bled the lines. It has now worked right since. He now says it might be the thermostat?

Mark helpful

Your Answer:

Related Questions

  • 2004 Pontiac Grand Prix only blowing cold air when heater is on 4 Answers

    I have a 2004 Pontiac grand prix , I blew a head gasket and had it repaired. Since then the heater was only blowing slightly hot air and now it only blows cold air. The coolant level id good and the...

    2004 Pontiac Grand Prix GT1

    -

    Maintenance & Repair

  • Pontiac heater blowing cold air. 2 Answers

    Okay so just yesterday morning i noticed my heater which is on the highest temp in the mornings didnt blow any hot air. Speed fan was fine. But when i noticed i started to move the nobs ti cold t...

    2003 Pontiac Grand Prix

    -

    Maintenance & Repair

  • Grand prix blowing cold air 1 Answer

    Had my thermostat and water pumped replaced, but its still blow cold air and won't defrost

    2005 Pontiac Grand Prix

    -

    Maintenance & Repair

  • 2004 pontiac grand prix 5 Answers

    I replaced the thermostat and water pump on my 2004 pontiac grand prix (non supercharged) and its still over heating. What do i do next?

    2004 Pontiac Grand Prix

    -

    Maintenance & Repair

  • pontiac grand prix no cold air and no heat but the fan works, whats wrong 2 Answers

    pontiac grand prix no cold air and no heat but the fan works, whats wrong

    2006 Pontiac Grand Prix Base

    -

    Maintenance & Repair

Grand Prix

Looking for a Used Grand Prix in your area?

CarGurus has 5 nationwide Grand Prix listings and the tools to find you a great deal.

Postal Code:

Shortcuts

Search Pontiac Grand Prix Questions

CarGurus Experts

  • #1
    munron
    Reputation
    8,220
  • #2
    James Sparrow
    Reputation
    7,520
  • #3
    Dorian Hendricks
    Reputation
    6,160
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Pontiac GTO
5 listings
Used Chevrolet Impala
12 Great Deals out of 112 listings starting at $3,531
Used Chevrolet Monte Carlo
8 listings
Used Pontiac G6
20 listings
Used Chevrolet Silverado 1500
211 Great Deals out of 5,943 listings starting at $3,995
Used Ford Mustang
53 Great Deals out of 1,256 listings starting at $4,995
Used Chevrolet Corvette
26 Great Deals out of 1,005 listings starting at $11,995
Used Dodge Magnum
3 listings starting at $4,700
Used Pontiac Grand Am
3 listings
Used Chevrolet Tahoe
19 Great Deals out of 716 listings starting at $5,995

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. Content will be removed if CarGurus becomes aware that it violates our policies.