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?
Very easy test, when the vehicle is at operating temp, feel the hoses going
into the heater core at the firewall. If they are hot going in and hot going
out you possibly have a problem with the blend air door. If it is hot in and
cold out the heater core is stopped up.
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