Cabin Temperature Sensor / Switch: Service and Repair

IN-CAR TEMPERATURE SENSOR REPLACEMENT

ATC In-Car Temperature Sensor:

The In-car Temperature Sensor is part of the ATC Control Head and not a separate service part. If defective, the complete ATC head must be replaced.

The ATC In-Car Temperature Sensor is located in the Control Head. The Control Head must be removed for service to the sensor.

REMOVAL

Negative Battery Cable Remote Terminal:

1. Open hood and disconnect the negative battery cable remote terminal from the remote battery post.
2. Remove snap-on center bezel which holds the ATC Control.
3. Disconnect the ATC Control from the vehicle wiring harness.
4. If the ATC in-car temperature sensor (fault 26) is verified to be bad, then the ATC control section of the assembly must be replaced. If the ATC in-car sensor does not pass the paper test, then the problem may only be with the ATC In-Car Sensor Fan-Motor assembly.
5. Remove the fan-motor assembly from the ATC control with two screws located on the back of the ATC control.
6. Replace only the fan-motor assembly if control does not pass the paper test, but passes with no fault code 26 (bad thermistor).

NOTE: Retest control. If ATC control still fails the paper test, then replace the ATC control and the fan-motor assembly. The ATC Control must be replaced if the part fails fault code 26 (after confirming proper wiring connections).

INSTALLATION
For installation, reverse the above procedures.