Symptom Starting Point

IMPORTANT: The following steps must be completed before using the symptom tables.

1. Perform the A Diagnostic System Check - HVAC Systems Manual before using the Symptom Tables in order to verify that all of the following are true:
^ There are no DTCs set.
^ The control module(s) can communicate via the serial data link.
2. Review the circuit description in order to familiarize yourself with the system functions. Refer to HVAC Blower Controls Circuit Description and HVAC Compressor Controls Circuit Description.

VISUAL/PHYSICAL INSPECTION
^ Inspect for aftermarket devices which could affect the operation of the HVAC System. Refer to Checking Aftermarket Accessories in Diagrams.
^ 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 and Poor Connections in Diagrams.

SYMPTOM LIST
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:
^ Blower Motor Inoperative at Any Speed
^ Blower Motor Operates at High Speed Only
^ Blower Motor Inoperative in One Speed Only
^ Cooling Insufficient, A/C System
^ Defrosting Insufficient
^ Heating Insufficient
^ Heat Excessive
^ Air Delivery Improper