Diagnosis Overview

The procedures in the following charts will help you diagnose V5 compressor and VDOT refrigerant system problems causing insufficient cooling. An experienced technician 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 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.