I have an ongoing problem with our Plymouth Voyager '99 3.3L van. Not much heat in cabin.
Here are symptoms:
*Replaced thermostat with 195 Degree - NEW
*Fluid Levels Fine
*Calibration test seems fine
*Fan works in all speeds
*Did not have system flushed - was making an appointment to do this and the fellow told me it would not help!
*The heater gets warm - sometimes hot but it is as if there is an air leak and cold air is blowing in with the warm/hot air. Anyone ever have this problem? We were in a snowstorm last night and traveled for miles at about 30 mph. The heat got hot then kinda went through a cycle when it seemed to blow cool and then cold air with the hot. I know the blend door motor is working - you can hear it. Not sure if it closes fully though. How can I inspect this?
Any suggestions?
JOHN