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*HVAC SYSTEM TEST (ATC) (CONTINUED) 2. A/C SYSTEM PERFORMANCE TEST NOTE: The following are prerequisites of the Cooldown Test. Verify each of the following before running the • If active, diagnose and repair DTC B1031 or B1032 before proceeding. Refer to the Table of Contents in • Verify that the refrigerant system has an adequate charge. Check and repair as necessary before pro- • Verify that the blower motor operates correctly in all speeds. Diagnose and repair all blower related faults • Verify that the work area ambient temperature is above 18.3°C (65°F) before proceeding. Move the vehicle • Verify that the evaporator temperature is above 18.3°C (65°F) before proceeding. • Verify that the A/C compressor is not running. If the A/C compressor is running, turn the A/C off and Once all of the prerequisites have been met, actuate the Cooldown Test by performing the following: Start the engine. With the scan tool in HVAC, select System Tests and then select Cooldown test. NOTE: The Cooldown Test can take up to two minutes to run. While the test is running, the A/C status • The ignition is turned off. • The A/C compressor is requested off. • The blower control is moved to the off position, unless the control was in the off position when the test • DTC B1031 or B1032 sets during the test. • the control receives a bus message to stop the test. Allow the test to run to completion before proceeding. With the scan tool, select View DTCs. Does the scan tool display any DTCs? Yes >> Diagnose and Repair the DTC(s). Refer to the Table of Contents in this Section for a complete list of HVAC related symptoms. Run the Cooldown Test again after the repair is complete. No >> As necessary, either Go To 3, or 4, or 5, or Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE). 24 - 348 HVAC - ELECTRICAL DIAGNOSTICS WK |