Important: Complete the following steps before using the symptom tables.
- Perform
Diagnostic System Check - HVAC Systems - Automatic
before using the Symptom Tables in order to
verify all of the following conditions:
| • | The control modules can communicate via the serial data link. |
- Review the system operation in order to learn the system functions.
Refer to the following procedures:
Visual/Physical Inspection
| • | Inspect the easily accessible components for obvious damage or
for conditions which may cause the symptom. |
| • | Verify the A/C compressor clutch turns freely and is not seized. |
| • | Verify that the customer is using the correct key to enable personalization
and is not activating the steering wheel or the passenger HVAC controls. |
| • | The following conditions may cause window fogging: |
| - | A blocked evaporator drain tube |
| - | Maximum passenger capacity |
| - | Blocked pressure relief valves |
| • | Inspect the air distribution system for causes of reduced airflow: |
| - | An obstructed or a dirty passenger compartment air filter |
| - | Air vents that are blocked or damaged |
Intermittent
Faulty electrical connections or wiring may be the cause of intermittent
conditions. Refer to
Testing for Intermittent Conditions and Poor Connections
in Wiring Systems.
Symptom List
Refer to a symptom procedure from the following list in order to diagnose
the symptom:
