A/C Fault (Stored)

NOTE: After making any repairs, perform BODY VERIFICATION TEST under VERIFICATION TESTS.

CAUTION: The evaporator temperature must be more than 55°F (12.7°C) and the work area ambient temperature must be more than 70°F (21.1°C) to test the A/C system operation.

NOTE: Active codes must be resolved before diagnosing stored codes.

NOTE: Anytime a DTC becomes active, or a Cooldown Test or HVAC Door. Recalibration fault message is displayed, return to the DIAGNOSTIC TROUBLE CODE IDENTIFICATION table and perform appropriate test.

NOTE: If multiple codes appear, diagnose those that relate to a short circuit first.

NOTE: Before actuating the AC Cooldown Test, verify that the A/C compressor is not running. If the compressor is running, turn the A/C off and allow the evaporator to warm up before proceeding with the test.

Start the engine. Press the A/C-Heater Control power switch on. Turn the mode select control to the panel position. Verify that the front blower motor and, if equipped, rear blower motor operates correctly in all speeds from each control. Diagnose and repair all blower related faults before proceeding with this test. Turn the front blower motor control to the high speed position. With the DRBIII® in HVAC, System Tests, actuate the A/C Cooldown Test. Turn the front blower motor control to the low speed position. If equipped, turn the rear blower motor control to the rear position. Set the passenger blend control to the full cold position. If equipped, set the zone/driver blend control to the full cold position. If equipped, on the Rear Blower Rear Control, set the rear blend/mode control to the full cold position. Monitor the DRBIII® for active HVAC DTCs while performing the following test steps. Turn the mode select control to the defrost position, wait 30 seconds, and then turn it back to the panel position. Press the recirculation mode switch on, wait 30 seconds, and then press it off. Press the A/C mode switch on, wait 30 seconds, and then press it off. Press the rear window defogger switch on, wait 30 seconds, and then press it off. Move the passenger blend control from full cold to full hot, wait 30 seconds, and then move it back to full cold. If equipped, move the zone/driver blend control from full cold to full hot, wait 30 seconds, and then move it back to full cold. If equipped, on the Rear Blower Rear Control, move the rear blend/mode control from full cold to full hot, wait 30 seconds, and then move it back to full cold. With the DRBIII® in HVAC, System Tests, actuate the HVAC Door Recalibration Test. If the DRBIII® displays any active HVAC DTC(s) or System Tests fault message(s), return to the symptom list and choose the symptom(s). If the DRBIII® does not display any active HVAC DTC(s) or System Tests fault message(s), there is no problem found at this time.