Operation CHARM: Car repair manuals for everyone.

Control Components






The manual climate control system heats or cools the vehicle interior depending on the function selector position and the temperature selected. Function selector position determines heating or cooling and air distribution. The temperature control setting determines air temperature. The blower motor switch varies the blower motor speed.

Control System Inputs
The climate control system inputs:
- select air inlet source (outside or recirculated).
- select blower motor speed.

Control System Outputs
The climate control system outputs are used to:
- direct vacuum to vacuum control motors to position the air management doors.
- vary blower motor speed by changing the current flow using resistor coils.
- position the temperature blend door to direct system airflow through or around the heater core.
- manage A/C compressor operation.