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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 225 (HVAC System - Automatic) >> Diagnostic Information and Procedures >> Air Temperature Malfunction >> Circuit/System Verification

Circuit/System Verification

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  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 Sun Load Sensor Circuit Malfunction below.
  2. 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 Ambient Air Temperature Sensor Circuit Malfunction below.
  3. Measure actual inside air temperature using a thermometer. Compare this value to the scan tool Inside Air Temp. Sensor parameter and Aux. Inside Air Temp. parameter. The measured temperature should be within 5 degrees of parameter.
    • If not within the specified range, refer to Inside Air Temperature Sensor Circuit Malfunction below.
  4. 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 Duct Temperature Sensor Circuit Malfunction below.
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