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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 934 (HVAC Systems - Manual) >> Diagnostic Information and Procedures >> HVAC Compressor Clutch Does Not Engage >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different car, the 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

The refrigerant temperature at the temperature sensor in the thermal expansion valve (TXV) controls cycling of the compressor clutch to prevent freezing of the evaporator core. The compressor is disabled when the temperature goes below 3°C (37°F) and vehicle speed is greater than 5 mph (8 km/h). The compressor is enabled when the temperature exceeds 4°C (40°F). The minimum cycling time OFF is 4 seconds. Refer to Air Temperature Description and Operation  for a voltage temperature value table of the evaporator temperature sensor.

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