Having problems with your 2007 Pontiac Grand Prix GXP Sedan ?
I have a 2007 grand prix, and the heater is blowing only cool air. according to the temp gauge the engine is running on the cold side as well. think a thermostat will be the fix?
Check your coolant level, if it is ok, it is most likely the thermostat stuck open.
Repair Help & Product Troubleshooting for 2007 Pontiac Grand Prix GXP Sedan
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