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*HVAC SYSTEM TEST (ATC) For a complete wiring diagram Refer to Section 8W. Theory of Operation The HVAC System Test provides a starting point in the diagnostic process by identifying the appropriate diagnostic Diagnostic Test 1. HVAC SYSTEM TEST NOTE: Diagnose and repair all active DTCs before diagnosing and repairing stored DTCs. Make a selection based on the symptom, condition, or DTC that you want to diagnose. For Any Active DTC Refer to the Table of Contents in this Section for a complete list of all HVAC related symptoms. Scan Tool Indicates HVAC Not Active On Bus (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) Complete HVAC System Test Go To 2 A/C System Performance Test Go To 2 General System Operation & Function Test Go To 3 Actuator Calibration Test Go To 4 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. 24 - 314 HVAC - ELECTRICAL DIAGNOSTICS LX |