Replace the front mode control motor See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/Front Mode
Control Motor Replacement.?
7. Disconnect the front mode control motor 7P connector.
8. Disconnect climate control unit connector A (40P).
9. Check for continuity between the following terminals of climate control unit connector A (40P) and the front mode control motor 7P
connector.
Is there continuity?
YES -
Go to step 10.
NO -
Repair an open in the wire(s) between the climate control unit and the front mode control motor.?
10. Check for continuity between body ground and climate control unit connector A (40P) terminals No. 31,No. 32,No. 33, and No. 34
individually.
Is there continuity?
YES -
Repair a short to body ground in the wire(s) between the climate control unit and the front mode control motor.?
