Symptom Table
IMPORTANT: Review the system operation in order to familiarize yourself with the system functions. Refer to the following procedures:^ Air Delivery Description and Operation
^ Air Temperature Description and Operation
Visual/Physical Inspection
^ Inspect for aftermarket devices which could affect the operation of the HVAC System. Refer to Checking Aftermarket Accessories in Diagnostic Aids.
^ 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. Refer to Air Temperature Description and Operation.
^ The following could 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 causes of reduced air flow:
^ Obstructed or dirty passenger compartment air filter, if equipped
^ Blocked or damaged air inlet or outlet vents
Intermittent
Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent and Poor Connections in Diagnostic Aids.
Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:
^ HVAC Compressor Clutch Does Not Engage
^ HVAC Compressor Clutch Does Not Disengage
^ Blower Motor Always On
^ Blower Motor Inoperative
^ Blower Motor Malfunction
^ Too Hot in Vehicle (Oldsmobile) or Too Hot in Vehicle (Pontiac)
^ Too Cold in Vehicle (Oldsmobile) or Too Cold in Vehicle (Pontiac)
^ Air Delivery Improper (Oldsmobile) or Air Delivery Improper (Pontiac)
^ Air Recirculation Malfunction (Oldsmobile Only)
^ Vacuum Control System Diagnostic
^ Leak Testing in Heating, Ventilation and Air Conditioning
^ Defrosting Insufficient in Heating, Ventilation and Air Conditioning
^ Odor Diagnosis in Heating, Ventilation and Air Conditioning