HVAC - Automatic

Symptoms - HVAC Systems - Automatic

Note:

1. Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle before using the Symptom Tables in order to verify that all of the following conditions are true:

* There are no DTCs set.

* The control modules can communicate via the serial data link.

2. Review the system operation in order to familiarize yourself with the system functions. Refer to Automatic HVAC Description and Operation HVAC - Automatic.

Visual/Physical Inspection

* Inspect for aftermarket devices which may affect the operation of the HVAC system. Refer to Checking Aftermarket Accessories Checking Aftermarket Accessories.

* Inspect for easily accessible or visible system components for obvious damage or conditions which may 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 Testing for Intermittent Conditions and Poor Connections.

Symptom List

Refer to HVAC System Malfunction HVAC System Malfunction in order to diagnose the symptom.