Visual/Physical Inspection

WARNING: This page is about a different car, the 2002 GMC Safari and 2002 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.

Inspect for aftermarket devices which could affect the operation of the HVAC System. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom. Verify the A/C compressor clutch turns freely and is not seized. The A/C compressor will not operate in cold outside air temperatures. The following conditions may cause window fogging:

Wet carpet or mats.
High humidity.
Interior water leak.
Blocked A/C evaporator drain tube.
Maximum passenger capacity.
Blocked body pressure relief valves.
Inspect the air distribution system for blocked or damaged air inlet or outlet vents.

See appropriate test under SYMPTOM TESTS .