Control System Inputs - Manual Climate Control
WARNING: This page is about a different car, the 2009 Mercury Grand Marquis and 2009 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
Climate Control Assembly
The climate control assembly has 3 system controls:
- The function selector switch combines a vacuum selector valve with 2 electrical switches to supply battery voltage (B+) to the A/C clutch circuit and the blower motor control circuit.
- Temperature selection is accomplished with a potentiometer connected to the temperature blend door actuator. Movement of the control knob from COOL (blue) to WARM (red) causes a corresponding movement on the temperature blend door and determines the temperature that the system will maintain.
- The blower motor switch controls blower motor speed by adding or bypassing resistors in the blower motor resistor.