A/C - Compressor (V-5) Diagnosis: Overview
89cadillac03Bulletin No. T-89-77
File in Group 1
Number 60
Corp. Ref No. 881203R
Date Feb. 1989
SUBJECT: V-5 COMPRESSOR DIAGNOSIS
MODELS AFFECTED: 1985-1988 CIMARRONS
This bulletin includes A/C and refrigerant system diagnosis procedures for 1985-1986 Cimarrons with 2.0L L-4 engines and all 1987-1988 Cimarrons.
The V-5 is a variable displacement compressor that meets air conditioning demand by changing its stroke instead of cycling the clutch. A control valve located in the rear head of the compressor senses compressor suction pressure and causes the compressor to vary its stroke. Because the V-5 compressor runs constantly and does not cycle, the diagnostic procedure is different from that used for fixed displacement compressor systems. By using this procedure, needless replacement of A/C components may be avoided.
This quick check procedure was developed to diagnose V-5 compressor and refrigerant system conditions involving reduced cooling. It must be used in conjunction with the proper Service Information Manuals and performed in the sequence given.