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HVAC System Test

NOTE: After making any repairs, perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
  1. Turn the ignition on. With the DRBIII®, attempt to communicate with the Powertrain Control Module. With the DRBIII®, attempt to communicate with the Body Control Module. With the DRBIII®, attempt to communicate with the Front Control Module. If the DRBIII® was able to communicate with the PCM, the BCM, and the FCM, go to the next step. If the DRBIII® was not able to communicate with the PCM, the BCM, and the FCM, refer to the communications section of the DIAGNOSTIC TROUBLE CODE IDENTIFICATION table for the related symptom(s). See DIAGNOSTIC TROUBLE CODE IDENTIFICATION  table.
  2. With the DRBIII®, read Powertrain/Engine Computer DTCs. If there are any HVAC related DTCs present, refer to the Powertrain Diagnostic Procedures for the related symptom(s). See DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If there are no HVAC related DTCs present, go to the next step.
  3. With the DRBIII®, read Body Computer DTCs. If there Are any DTCs present, refer to the appropriate category for the related symptom(s). See DIAGNOSTIC TROUBLE CODE IDENTIFICATION  table. If there are no DTCs present, go to the next step.
  4. With the DRBIII®, read Front Control Module DTCs. If there are any DTCs present, refer to the symptom list in the related category. See DIAGNOSTIC TROUBLE CODE IDENTIFICATION  table. If there are no DTCs present, go to the next step.
    NOTE: 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.
    CAUTION: Active codes must be resolved before diagnosing stored codes.
    WARNING: Anytime a DTC becomes active, or a Cooldown Test or HVAC Door Recalibration fault message is displayed, return to the symptom list and choose the symptom. See DIAGNOSTIC TROUBLE CODE IDENTIFICATION  table.
    NOTE: If multiple codes appear, diagnose those that relate to a short circuit first.
  5. 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. 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. With the DRBIII® in HVAC, System Tests, actuate the AC 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, return to the symptom list and choose the symptom(s). See DIAGNOSTIC TROUBLE CODE IDENTIFICATION  table. If the DRBIII® does not displays any active HVAC DTC(s) or System Tests fault message, go to the next step.
  6. With the DRBIII®, read PCM DTCs. If there are any HVAC related DTCs present, refer to the Powertrain Diagnostic Procedures related symptom(s). See DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If there are no HVAC related DTCs present, recheck the climate control system performance. See PERFORMANCE TESTS in MANUAL A/C-HEATER SYSTEMS article in HVAC.
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