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1983sc heater control

Heating and Ventilation

Vehicle Information: Year: 1983; Body Type: Coupe;

my car has the auto climate control,my question is what controls the temp.of the airflow coming through the vents.when i turn the control knob to turn the heat on the motor that opens and closes the heat exchangers travels its entire length and i have max.heat with no way to regulate the temp.i have replaced the computer board in the heater control housing but i still have max.heat.all other aspects of the system seem to work fine.i also am not getting the e mails from the tech site when i try to register i am told that i am already registered and i am but am not getting the info. even though i have in the past gotten it.

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