General System Diagnosis

1. Verify the customer's concern by operating the climate control system to duplicate the condition.
2. Inspect to determine if one of the mechanical or electrical concerns apply:

VISUAL INSPECTION CHART

Mechanical
- Loose, missing or damaged A/C compressor drive belt.
- Loose or disconnected A/C clutch.
- Excessive A/C clutch air-gap.
- Loose, misrouted or damaged vacuum lines.*
- Broken or leaking vacuum control motor.*
- Broken or leaking refrigerant lines.

Electrical
- Open fuses.
- Blower motor inoperative.
- A/C compressor inoperative.
- Circuitry open/shorted.
- Disconnected electrical connectors.

* A leak in the vacuum control circuit may occur during acceleration (slow leak), may exist at all times (large leak), and may exist only when specific functions are selected (indicating a leak in that portion of the circuit). The vacuum hoses used in the passenger compartment control circuit are constructed from PVC plastic material. The vacuum hoses used in the engine compartment are constructed of Hytrel(R). Because of the materials used, never pinch the vacuum hoses off during diagnosis to locate a leak. A wood golf tee can be used as a plug when it is necessary to plug one end of the vacuum hose for leak test purposes.

3. If the inspection reveals obvious concern(s) that can be readily identified, service as required.
4. If the concern remains after the inspection, determine the symptom and go to the Symptom Chart. Symptom Related Diagnostic Procedures