Step 1 - Preliminary Checks

The procedures in the following charts will help you diagnose V5 compressor and VDOT refrigerant system problems causing Insufficient cooling. They must be used In conjunction with other appropriate service manual Information.

The V5 compressor is a variable displacement compressor which matches air conditioning demand by changing its stroke, Instead of cycling its clutch. A control valve located in the rear head of the compressor senses compressor low side pressure and causes the compressor mechanism to change stroke. Because the V5 compressor always runs and the system does not cycle, these diagnostic procedures differ from those used for fixed displacement systems. By using these procedures, you will avoid needlessly replacing A/C components.

Repair the following as necessary. If discharge air temperature with A/C on is normal after making the following repairs, the system is operating properly.

^ A/C fuse
^ A/C blower operation.
^ Temperature door. Move temp. door lever rapidly from cold to hot. Listen for temp. door hitting at each end. Adjust as necessary. (Cable operated temp. door only.).
^ Clutch coil and rear head switch(es) connections.
^ Compressor belt. Adjust or replace if damaged or missing.
^ Engine cooling fan operation.
^ Condenser - Check for restricted air flow.
^ Dealer Technical Bulletins and Service Guild for updates on A/C System