Question about 2000 Pontiac Grand Prix

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Heater is not working properly.

I get warm air when the car is warmed up, but not very much. the higher I adjust the fan the cooler the air becomes. Note: I took my car to get the oil changed awhile back and they took my cabin filter out and showed me that it was dirty, but I had them put it back in because I figured I could replace it myself for cheaper. I dont know where the thing is located at. Thanks for any information you can give.
Also, is it possible that the cabin filter may be obstructing the mechanism that controls the heater core flow?

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At operating temperature is you car at the middle mark in between 160F and 210F? If not your thremostat is stuck open not allowing your engine to warm up before the coolant from the radiator enters the engine. Any "CHECK ENGINE SOON". lights? Just had a similar prob. Changed the thermostat and light went ount at next drive!

Posted on Feb 08, 2009

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3) If engine temperature is normal, then check the temperature of pipes that go to/from heater core. These pipes are located up the fire wall (easier access is from the passenger side). If pipe/pipes are cold (even engine is warm) it means you heater core is plugged and should be flushed. Keep in mind, flushing the whole cooling system is different from flushing heater core.
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