2004 Buick Park Avenue Heater problem

2004 BUICK PARK AVENUE
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MARKUS459
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Heater problem
2004 Buick Park Avenue 6 cyl Front Wheel Drive Automatic

2004 park avenue with climate control. Heater blows cold air. I have cleaned the cooling system and replaced the thermostat. After letting the car warm up, I noticed that the heater inlet hose was hot but the outlet hose was cold. Is there a shutoff or does the water circulate through the heater at all times? I'm not sure if the core is plugged or if it is a control problem.
Please help.
Nov 20, 2009 at 3:40 PM
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JACOBANDNICKOLAS
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Actually, your car has a blend door that opens and closes to allow heat to enter the vehicle. With the engine hot, running, and the heater on, both heater core hoses should be hot. I would start by flushing the heater core. Like you mentioned, it may be plugged.

Let me know what you find.
Nov 25, 2009 at 8:25 AM