Service Information

Volt

Symptoms - HVAC Systems - Automatic

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

Perform the Diagnostic System Check - Vehicle before using the Symptom Tables 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.

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

•	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 personalisation 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

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections .

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom: