Heating and A/C

Non-computer aided diagnostics should be performed first. Hood of vehicle should he closed during the diagnostic test to keep engine heat from effecting the ambient temperature sensor.

FAILURE CODE 1
- Involves the wiring or the ATO control head.

FAILURE CODES 2, 13, 14, 15, 20, and 23
- Involves the wiring, blend-air door actuator, or the ATC control head.

FAILURE CODES 3, 16, 17, 18, 19, and 24
- Involves the wiring, mode door actuator, or the ATC control head.

FAILURE CODE 4
- Involves the wiring, blend-air door actuator, mode door actuator, fresh/recirc. door actuator, or the ATC control head.

FAILURE CODE 5
- Involves the wiring, fresh/recirc. door actuator, or the ATC control head.

FAILURE CODE 6
- Involves the compressor circuit signal wiring, or the ATC control head.

FAILURE CODE 7
- Involves the blower wiring, power module, or the ATC control head.

FAILURE CODES 8, 21, 22
- Requires replacing the ATC control head.

FAILURE CODES 9, and 27
- Involves the wiring, sun sensor, or the ATC control head.

FAILURE CODES 10, and 28
- Involves the wiring, water temperature sensor, or the ATC control head.

FAILURE CODES 11, and 25
- Involves the wiring, ambient temperature sensor, or the ATC control head.

FAILURE CODES 12, and 26
- Involves the wiring, in-car temperature sensor/aspirator, or the ATC control head.