My heater will only blow warm air when the car is running and not moving. Once the car gets moving, over a short amount of time (perhaps 1-3 minutes) the warm air becomes cool and then cold. Of course the temperatures outside in Virginia are cold right now also.

Is there somekind of "cold air" door that is normally supposed to be closed and controlled by the temperature "wheel" that is opening and letting in air from outside?

Anyone have any other ideas?

Thanks.

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1967 Dodge Coronet R/T (SOLD)
2001 Volvo S80 (Accident; bought by Insurance)
1996 Volvo 850 Wagon (SOLD)
1982 Mercedes Benz 240D (Accident; bought by Insurance)
1988 Mercedes Benz 300CE (Deer Strike; bought by insurance)
2002 Volvo XC70
1985 300 CD