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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> HVAC - Automatic >> Diagnostic Information and Procedures >> Air Temperature Malfunction >> Circuit/System Verification

Circuit/System Verification

  1. Ignition ON, cover the sunload sensor assembly with a shop towel or other suitable item. Verify the scan tool Right Sunload Sensor and Left Sunload Sensor parameters are within 3 counts of each other.
    • If not within the specified range, refer to Circuit/System Testing  for Sun Load Sensor Circuit Malfunction.
  2. Remove the shop towel and shine a flashlight on the sunload sensor assembly. Verify the scan tool Right Sunload Sensor and Left Sunload Sensor parameters are within 3 counts of each other.
    • If not within the specified range, refer to Circuit/System Testing  for Sun Load Sensor Circuit Malfunction.
  3. Measure actual outside air temperature using a thermometer. Compare this value to the scan tool Outside Air Temp. Raw parameter. The measured temperature should be within 5 degrees of parameter.
    • If not within the specified range, refer to Circuit/System Testing  for Ambient / Inside Air Temperature Sensor Circuit Malfunction.
  4. Measure actual inside air temperature using a thermometer. Compare this value to the scan tool Inside Air Temp. parameter. The measured temperature should be within 5 degrees of parameter.
    • If not within the specified range, refer to Circuit/System Testing  for Ambient / Inside Air Temperature Sensor Circuit Malfunction.
  5. Measure actual temperature using a thermometer at each of the duct temperature sensors. Compare this value to the appropriate scan tool Duct Actual parameter. The measured temperature should be within 5 degrees of appropriate Duct Actual parameter.
    • If not within the specified range, refer to Circuit/System Testing  for Duct Temperature Sensor Circuit Malfunction.
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