Initial Inspection and Diagnostic Overview

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
[a]: 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 arc 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, connect a scan tool to the Data Link Connector (DLC) located beneath the instrument panel to carry out the DATA LINK DIAGNOSTICS test. If the DATA LINK DIAGNOSTICS test is passed, retrieve the continuous Diagnostic Trouble Codes (DTCs).
5. If no DTCs are retrieved, go to the Symptom Chart to continue diagnostics. Symptom Related Diagnostic Procedures
6. If DTCs are retrieved, go to the Diagnostic Trouble Code (DTC) Index to continue diagnostics. Diagnostic Trouble Code Tests and Associated Procedures