A/C - System Diagnostic Procedure: Overview
88Chevy32Number: 89-38-1B
Section: 1B
Date: NOV., 1988
Subject: V5 AIR CONDITIONING AND REFRIGERANT SYSTEM DIAGNOSTIC PROCEDURE
Model and Year: 1984-89 CHEVROLET MODELS EQUIPPED WITH V5 COMPRESSOR
TO: ALL CHEVROLET DEALERS
The V5 is a variable displacement compressor that meets air conditioning demand by changing its stroke instead of cycling a clutch. A control valve located in the rear head of the compressor senses compressor suction pressure and causes the compressor to change stroke. Because the V5 Compressor runs constantly and does not cycle, the diagnostic procedure is different from that used for fixed displacement systems. By using this procedure, needless replacement of AC components may be avoided.
This quick check procedure was developed to help you diagnose V5 Compressor and refrigerant system conditions involving reduced cooling. It must be used in conjunction with the proper service manuals and performed in the sequence given.