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Home >> Chevrolet >> 2015 >> Cruze LT, Automatic Trans >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> HVAC System - Automatic >> Diagnostic Information and Procedures >> HVAC System Malfunction >> Circuit/System Verification

Circuit/System Verification

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 does not operate properly in each speed position 

      Refer to DTC B0193 .

    • If the blower motor operates properly in each speed position 
  4. Verify the scan tool Air Quality Sensor parameter changes while introducing hydrocarbons from a suitable source into the vicinity of the B108 Air Quality Sensor.
    • If the Air Quality Sensor parameter does not change 

      Refer to DTC B3843 .

    • If the Air Quality Sensor parameter changes 
  5. Verify the HVAC doors listed below move when pressing the appropriate switch.
    • Temperature
    • Mode
    • Recirculation
    • If all HVAC doors move 
  6. Install the J43600 ACR Air Conditioning Service Center.
  7. Verify the high side pressure reading on the Air Conditioning Service Center is within 10% of the scan tool A/C High Side Pressure Sensor parameter.
    • If the reading is within 10% 
  8. Verify the scan tool 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) 
  9. Verify the scan tool parameters listed below are within 10% of ambient temperature.
    • Lower Left Duct Air Temperature Sensor
    • Upper Left Duct Air Temperature Sensor
    • A/C Evaporator Temperature Sensor
    • If within 10% of ambient temperature 
  10. Verify the scan tool Windshield Temperature parameter is within 10% of ambient temperature.
    • If within 10% of ambient temperature 
  11. Verify the scan tool Passenger Compartment Humidity parameter is within 10% of actual humidity.
    • If within 10% of actual humidity 
  12. Engine ON, A/C system ON
  13. 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 
  14. Verify warm air flows from the ducts with the temperature control in the warmest position.
    • If the air is warm 
  15. Engine OFF, ignition ON.
  16. Verify the scan tool Sunload parameter changes while covering the B10B Ambient Light/Sunload Sensor with a shop towel or other suitable item.
    • If the Sunload parameter changes 
  17. Verify the actual inside air temperature, using a thermometer, is less than 3°C (5°F) difference from the scan tool Inside Passenger Compartment Air Temp. Sensor parameter.
    • If less than a 3°C (5°F) difference 
  18. Verify the vehicle is not equipped with an E40 Electrical Auxiliary Heater.
    • If the vehicle is equipped with an E40 Electrical Auxiliary Heater 
    1. Verify the E40 Electrical Auxiliary Heater turns On and Off when commanded within the conditions for proper operation listed in Automatic HVAC Description and Operation .
      • If the E40 Electrical Auxiliary Heater does not turn On and Off when commanded within the conditions for proper operation

        Refer to DTC B048D or B048E .

      • If the E40 Electrical Auxiliary Heater turns On and Off when commanded within the conditions for proper operation
    2. All OK.
    • If the vehicle is not equipped with an E40 Electrical Auxiliary Heater 
  19. All OK.
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