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Home >> Chevrolet >> 2015 >> Cruze LT, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 29 (HVAC System - Manual) >> Diagnostic Information and Procedures >> HVAC System Malfunction (C60) >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2015 Chevrolet Trax and 2015 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:

Check for bulletins before proceeding.

  1. Ignition ON.
  2. Verify every applicable scan tool Switch parameter changes when pressing the appropriate switch on the A26 HVAC Controls.
    • If any parameter does not change 

      Replace the A26 HVAC Controls.

    • If all parameters change 
  3. Verify the blower motor operates properly with the blower motor switch in each speed position.
    • If the blower motor operates properly in each speed position 
  4. Verify the air inlet door works properly when commanded.
    • If the air inlet door does work properly 
  5. Install the appropriate ACR Air Conditioning Service Center, ignition ON.
  6. Verify the high side pressure reading on the Air Conditioning Service Center is within 10% of the scan tool ECM A/C High Side Pressure Sensor parameter.
    • If the reading is within 10% 
  7. Verify the ECM A/C High Side Pressure Sensor parameter is between 269-2929 kPa (39-425 PSI).
    • If the reading is between 269-2929 kPa (39-425 PSI) 
  8. Verify the scan tool HVAC A/C Evaporator Temperature Sensor parameter listed is within 10% of ambient temperature.
    • If not within 10% of ambient temperature 

      Refer to DTC B3933 .

    • If within 10% of ambient temperature 
  9. Verify the A/C compressor clutch engages and disengages when commanding the ECM A/C Compressor Clutch Relay On and Off with a scan tool.
    • If the A/C compressor does engage 
  10. Engine ON, A/C system ON.
  11. Verify cool air flows from the ducts with the temperature control in the coldest position.
    • If the air is not cool 
    1. Verify the Q2 A/C Compressor Clutch is engaged.
    • If the air is cool 
  12. Verify warm air flows from the ducts with the temperature control in the warmest position.
    • If the air is warm 
  13. All OK.
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