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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1943 (HVAC System - Manual) >> Description and Operation >> Air Temperature Description and Operation >> HVAC Control Components >> HVAC Control Module >> Evaporator Low Ambient Protection

Evaporator Low Ambient Protection

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

The refrigerant temperature at the temperature sensor on the evaporator case 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 8 km/h (5 mph). The compressor is enabled when the temperature exceeds 4°C (40°F). The minimum cycling time off is 4 seconds.

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