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:

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