For 1990-2009 cars

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

Refer to Air Delivery Description and Operation .

### Visual/Physical Inspection

• | Inspect for aftermarket devices which could affect the operation of the system. Refer to Checking Aftermarket Accessories .

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

### Intermittent

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

### Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:

• | Air Delivery Improper

• | Blower Motor Malfunction

• | Improper Control Response

• | Too Cold in Vehicle

• | Too Hot in Vehicle