Question about 2003 Pontiac Grand Am
Hey could you help me? My Pontiac is only blowing cold air. The thermastate seems to be fine because the car is heating up. The temperature control dial is digital and the lights for the A/C and the rear defrost arent working either. I tried to replace the fuses or defusers associated but t hey arent blown.
What could be the problem, and should I keep looking at the defusers to find if one is out?
The heater core might be clogged. It's located behind the dashboard usually. Just follow the supply and return lines through your fire wall in the engine compartment. Run the engine for awhile then carefully hold the return line, if it's cold you have a clog and the core needs replacement.
Posted on Jan 01, 2009
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Posted on Jan 02, 2017
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Temperature Control Blend Door Failure No Heat
In all modern cars there is a tiny DC electric motor driven gear drive that moves a plastic door that blends heated and cooled air from the AC and the heater core, this is called (interestedly enough) the air temperature control blend door actuator. The motor that moves this door fails because the door starts sticking from warping, most common complaint is no heat but it can be no AC as well. To replace these parts (blend door and blend door actuator) you must remove the entire dash from the car. Always have this problem confirmed by a dealer or qualified repair shop as it is a very expensive repair.
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