Chevrolet Trax: Symptoms - HVAC systems - automatic

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

1. Perform the Diagnostic System Check - Vehicle before using the HVAC System Malfunction procedure in order to verify that all of the following 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.

Visual/Physical Inspection

NOTE: Shutting one or more outlets may adversely affect the Automatic HVAC system by producing erroneous duct air temperature sensor readings in the duct connecting to the closed outlet. Where possible, always operate the Automatic HVAC system with all outlets open.

• Inspect for aftermarket devices which may affect the operation of the HVAC System. Refer to Checking Aftermarket Accessories .
• Inspect the easily accessible or visible system components for obvious damage or conditions which may cause the symptom.
• Verify the A/C compressor turns freely and is not seized.
• Verify that the customer is using the correct key to enable personalization and is not inadvertently activating auxiliary HVAC controls.
• The A/C compressor will not operate in cold outside air temperatures.
• 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

• 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. Refer to Testing for Intermittent Conditions and Poor Connections .

Symptom List

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

READ NEXT: