For 1990-2009 cars

Important: Review the system operation in order to familiarize yourself with the system functions. Refer to the following:

• | 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 Wiring Systems.

• | Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

• | Inspect the 25 Amp A/C fuse for an open.

• | Inspect all related ground points for being clean and tight.

### Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

### 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

• | Condenser Fan Always On

• | Condenser Fan Inoperative