Vauxhall Workshop Service and Repair Manuals > Astra J > HVAC | HVAC - Manual | Diagnostic Information and Procedures | Miscellaneous

Symptoms - HVAC Systems - Manual

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

1.	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.

2.	Review the system operation in order to familiarize yourself with the system functions. Refer to Manual 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 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

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:

•	Air Conditioning Compressor Malfunction

•	Blower Motor Malfunction

•	Air Temperature Malfunction

•	Air Delivery Improper

•	Air Recirculation Malfunction