Symptoms

SYMPTOMS - HVAC SYSTEMS - AUTOMATIC

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

1. Perform the Diagnostic System Check - HVAC Systems - Automatic before using the Symptom Tables in order to verify that all of the following are true:
- There are no DTCs set.
- The control module can communicate via the serial data link. HVAC System - Automatic
2. Review the system operation in order to familiarize yourself with the system functions.
- Air Delivery Description and Operation
- Air Temperature Description and Operation

VISUAL/PHYSICAL INSPECTION
1. Inspect for aftermarket devices which could affect the operation of the HVAC System.
2. Inspect the easily accessible or visible system component- for obvious damage or conditions which could cause the symptom.
3. Verify the A/C compressor clutch turns freely and is not seized.
4. Verify that the customer is using the correct key to enable personalization.
5. The A/C compressor will not operate in cold outside air temperatures. Refer to Air Temperature Description and Operation.
6. The following conditions may cause window fogging:
- Wet carpet or mats
- High humidity
- Interior water leak
- Blocked A/C evaporator drain tube
- Maximum passenger capacity
- Blocked body pressure relief valves
7. Inspect the air distribution system for causes of reduced air flow:
- Obstructed or dirty passenger compartment air filter, if equipped
- Blocked or damaged air inlet or outlet vents

INTERMITTENT
Faulty electrical connections or wiring may be the cause of intermittent conditions.

SYMPTOM LIST
Refer to a symptom diagnostic procedure from the following list in order to diagnosis the symptom:
- HVAC Compressor Clutch Does Not Engage
- HVAC Compressor Clutch Does Not Disengage
- Blower Motor Always On
- Blower Motor Inoperative
- Blower Motor Malfunction
- Too Hot the Vehicle
- Too Cold in Vehicle
- Air Delivery Improper
- Air Recirculation Malfunction
- Leak Testing in Heating, Ventilation and Air Conditioning
- Noise Diagnosis - Blower Motor in Heating, Ventilation and Air Conditioning
- Noise Diagnosis - Air Conditioning (A/C) System in Heating, Ventilation and Air Conditioning
- Noise Diagnosis - HVAC Module in Heating, Ventilation and Air Conditioning
- Odor Diagnosis in Heating, Ventilation and Air Conditioning