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Home >> Buick >> 2015 >> Regal GS, AWD >> 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 in each speed position 

      Refer to DTC B0193 .

    • If the blower motor operates properly in each speed position 
  4. Verify the HVAC doors listed below move when pressing the appropriate switch.
    • Driver Temperature
    • Passenger Temperature
    • Mode
    • Recirculation
    • Air Inlet
    • If all HVAC doors move 
  5. Install the J43600  ACR Air Conditioning Service Center.
  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 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 parameters listed below are within 10% of ambient temperature.
    • Lower Left Duct Air Temperature Sensor
    • Upper Left Duct Air Temperature Sensor
    • Lower Right Duct Air Temperature Sensor
    • Upper Right Duct Air Temperature Sensor
    • A/C Evaporator Temperature Sensor
    • If within 10% of ambient temperature 
  9. Verify the scan tool parameters listed below are within 10% of actual conditions.
    • Passenger Compartment Humidity
    • Passenger Compartment Humidity Sensor Temperature
    • Passenger Compartment Windshield Temperature
    • If within 10% of actual conditions 
  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. Engine OFF, ignition ON.
  14. Verify the scan tool Sunload parameter changes while covering the B10B Ambient Light/Sunload Sensor with a shop towel and changes when shining a bright light on it.
    • If the Sunload parameter changes 
  15. 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 
  16. Verify the vehicle is equipped with RPO code HP6.
    • If the vehicle is not equipped with RPO code HP6. 

      Refer to step 18.

    • If the vehicle is equipped with RPO code HP6. 
  17. Verify the G17 Heater Coolant Pump turns On and Off when commanded with a scan tool.
    • If the G17 Heater Coolant Pump does turn On and Off 
  18. All OK.
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