Having a problem with the heater blowing cold air while its moving.

Asked by edgar Jan 06, 2015 at 09:04 PM about the 2007 Pontiac Grand Prix Base

Question type: Maintenance & Repair

I have a 2007 Pontiac Grand Prix and while it idles and i turn on the heater it works fine,
but as soon as i start moving, it starts blowing cold air. I changed the thermostat, it has
coolant, the hoses get hot and i even change the  climate control module and still
nothing. Could anyone help figure out what this could be?

3 Answers
30,540

mikeatpriestlake answered 9 years ago

Make sure the coolant level is full, then bleed the air out of the system. There are some good YouTube videos on the subject.

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