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*HVAC SYSTEM TEST (MTC) (CONTINUED) 2. A/C SYSTEM PERFORMANCE TEST NOTE: The work area ambient temperature must be above 15.6°C (60°F) and the evaporator temperature NOTE: Before actuating the Cooldown Test, verify that the mode setting is not in a defrost position and that NOTE: Running the Cooldown test will cause the A/C status indicator to flash. NOTE: One or more status messages will display on the scan tool after running the Cooldown Test. These Verify that the front blower motor operates correctly in all speeds. Diagnose and repair all blower related faults Set the front blower speed to high. With the scan tool in HVAC, select System Tests and then select Cooldown test. Allow the test to run to completion. Does the scan tool display a status message that indicates a fault has occurred? Yes, Conditions Too Cold - Test Not Run If running, turn the A/C compressor off. Verify that the work area ambient temperature is above 15.6°C Yes, Blowers Not On High - Test Not Run Set the front blower speed to high speed and then rerun the Cooldown Test. Yes, No Results Stored/Test Not Complete Verify that power is not interrupted while rerunning the Cooldown Test. Yes, Refrigerant Temperature Sensor Error Refer to B1079–CLIMATE CONTROL COOL DOWN TEST EXCESSIVE TIME (ATC & MTC) for the Yes, DTC Set During Routine - Test Not Passed Refer to B1079–CLIMATE CONTROL COOL DOWN TEST EXCESSIVE TIME (ATC & MTC) for the No >> As necessary, either Go To 3, 4, or 5, or Perform BODY VERIFICATION TEST - VER 1. HB HVAC - ELECTRICAL DIAGNOSTICS 24 - 317 |