System Check - Preliminary - HVAC System - Automatic

The purpose of the symptom diagnostic procedures is to diagnose the following components for any problems that may cause insufficient cooling:
^ The V5 compressor
^ The VDOT refrigerant system

The V5 Compressor is a variable displacement compressor. The V5 compressor responds to the air conditioning demands by changing the stroke rather that cycling the clutch. A control valve is located in the rear head of the A/C compressor. The control valve completes the following functions; senses the compressor low side pressure and causes the compressor mechanism to stroke. The V5 compressor always runs and the system does not cycle. These diagnostic procedures differ from those used for fixed displacement systems. Use the symptom diagnostic procedures in order to avoid unnecessary replacement of any A/C components.

The A/C system is operating properly if the discharge air temperature and compressor pressures are equal to those in the System Performance Test

Preliminary Checks
^ Inspect the A/C fuse, replace as necessary.
^ Inspect the A/C blower operation, repair as necessary.
^ Inspect the clutch coil electrical connection, repair as necessary.
^ Check for diagnostic codes, repair as necessary.
^ Inspect the drive belt, replace the drive belt if it is damaged.
^ Inspect the operation of the electric cooling fans, repair as necessary.
^ Inspect the condenser for restricted air flow, clean as necessary.
^ Inspect the system for any restrictions in the air flow.