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*HVAC SYSTEM TEST (MTC) (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 31 or 32 before proceeding. Refer to the Table of Contents in this • 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 compressor is running, turn the A/C off and allow the Once all of the prerequisites have been met, actuate the Cooldown Test by performing the following: • If not done so previously, start the engine. • Press and hold the A/C mode switch down and then turn the blower motor control to high speed. Continue to • NOTE: The Cooldown Test can take up to two minutes to run. While the test is running, the A/C status • Allow the test to run to completion before proceeding. Actuate the Display DTC function by performing the following: • Turn the blower control on. • Press the A/C mode switch down, turn the blower control to off, wait 5 seconds and then release the A/C mode NOTE: The A/C status indicator displays active DTCs when the EBL status indictor is not illuminated and Does the A/C status indicator 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 Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE). 24 - 352 HVAC - ELECTRICAL DIAGNOSTICS WK |