Crown Victoria V8-4.6L CNG SOHC VIN 9 (1999)
Control Assembly: Description and Operation
The climate control assembly has three system controls:
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The A/C heater function selector switch combines a vacuum selector valve with two electrical switches to supply battery voltage (B+) to the A/C
clutch circuit and the blower motor speed control circuit.
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Temperature selection is accomplished with a potentiometer connected to the electric blend door. Movement of the control knob from COOL
(Blue) to WARM (Red) causes a corresponding movement on the air temperature blend door and determines the temperature that the system will
maintain.
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The blower motor switch controls blower motor speed by adding or bypassing resistors in the heater blower motor switch resitor.
