Auto Air Conditioning & Heater Repair: Heating on Chrysler Sebring, sebring convertable, chrysler sebring

Question
My Chrysler Sebring convertable only blows heat at 35 mph. What could be causing this?

Answer
What is the past repair history of the vehicle ?.

Possibilities are:

1. faulty thermostat.

2. faulty damper door operation via the heater control
  module and or mis-adjustment.

3. Partially restricted radiator.

4. Low coolant level in the radiator.


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