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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 >> DTC B0158, B0163, B0168, B0173, B0178, B0509, B0514, B3578 or B3583 >> Circuit/System Verification

Circuit/System Verification

  1. 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.
  2. 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.
  3. 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/Evaporator Temperature Sensor Circuit Malfunction.
  4. Measure actual temperature using a thermometer at the A/C evap. temperature sensor. Compare this value to the scan tool A/C Evap. Temperature Sensor parameter. The measured temperature should be within 5 degrees of the parameter.
    • If not within the specified range, refer to Circuit/System Testing  for Duct Temperature/Evaporator Temperature Sensor Circuit Malfunction.
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