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i just bought a 98 park ave and i had the iossue of hot on passenger side and cold out the driv ers i was told i had to replace the control head and both accuators...... i did a trani flush and it fixe my problem
Make sure there are no leaks and that the system is full to capacity. After the vehicle has warmed up check radiator hoses for temperature differecial also check heater core hoses. A significant difference in temperature may indicate a plugged heater core or thermostat failure
it sounds like you have a blend door problem. This is located in the HVAC sysem it closes a door from cold side to hot side. sounds like a bad servo motor or a vacuum leake on that motor. Hope this helps you, please rank this solution