Download Free Ford’s Electronic Blend Door Actuator Air Conditioning Manual.pdf Many of Ford’s manual air conditioning systems use an electronic blend door actuator (motor) to control the temperature of the air entering the passenger compartment. The temperature knob on the A/C–Heater control panel is a variable resister (potentiometer) which varies a voltage signal to the motor. This signal determines blend door movement. Complaints of temperature always hot, cold or not changing as the temperature knob is rotated will be caused by one of four problems: 1) bad actuator; 2) bad potentiometer; 3) open or shorted wire(s); 4) broken door.
A digital volt/ohm meter (DVOM) is required for testing. The motor has an eight pin connector with five wires. With the connector unplugged and the ignition switch in the run position, check:
A digital volt/ohm meter (DVOM) is required for testing. The motor has an eight pin connector with five wires. With the connector unplugged and the ignition switch in the run position, check:
- Battery voltage on pin #7
- Proper ground on pin #8
- Continuity between pin #4 and pin #6
- Varying continuity between pin #3 and #4 or between #3 and #6 as the potentiometer is rotated from warm to cool to warm.
- Battery voltage between pin #7 and #8
- Near battery voltage on pin #4
- Varying voltage on pin #3 as potentiometer is rotated between warm and cool.
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