- Preliminary Information

IMPORTANT: Review the Air Delivery Description and Operation and the Air Temperature Description and Operation in order to familiarize yourself with the system functions.

Visual/Physical Inspection
^ Inspect for aftermarket devices which could affect the operation of the 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.
^ 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 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
^ Air Recirculation Malfunction

Refer to Symptoms - Cooling System in Cooling System for diagnosis of the electric cooling fans. Symptom Related Diagnostic Procedures

Refer to the following in Heating, Ventilation and Air Conditioning:
^ Leak Testing
^ Air Conditioning (A/C) System Performance Test
^ VDOT Air Conditioning (A/C) System Diagnosis
^ Noise Diagnosis - Air Conditioning (A/C) System
^ Odor Diagnosis