For 1990-2009 cars only
Important: Review the system operation in order to familiarize yourself with the system functions. Refer to HVAC Blower Controls Circuit Description HVAC Blower Controls Circuit Description - Auxiliary HVAC Compressor Controls Circuit Description Temperature Control Motor Circuit Description .
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. |
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:
| • | Defrosting Insufficient in Heating, Ventilation, and Air Conditioning |
| • | Heat Excessive in Heating, Ventilation, and Air Conditioning |
| • | Air Delivery Improper in Heating, Ventilation, and Air Conditioning |
| • | Noise Diagnosis in Heating, Ventilation, and Air Conditioning |
| • | Odor Diagnosis in Heating, Ventilation, and Air Conditioning |
