A/C - Moan Noise With Compressor Engaged
89chevy12GMC NUMBER: 88-T-209
GROUP: 1B-Air Conditioning
DATE: April, 1989
CORPORATE
NUMBER: 861203R
SUBJECT: MOAN NOISE WITH A/C COMPRESSOR ENGAGED
MODELS: 1985-1988 LIGHT AND MEDIUM DUTY VEHICLES WITH THE R-4 A/C COMPRESSOR AND WITHOUT SERPENTINE BELT DRIVE
An A/C moan on a light or medium duty vehicle equipped with one of the engines listed below can be addressed by replacing the A/C compressor pulley.
YEAR MODELS ENGINES
1985 C/K 4.3L 5.0L 5.7L 6.2L Diesel
M 4.3L
S/T 2.2L Diesel
G 4.3L 5.0L 5.7L
P 4.8L 5.7L
1986 C/K/P 4.3L 5.0L 5.7L
M 4.3L
S/T 2.2L Diesel
G 4.3L 5.0L 5.7L
1987 R/V/P 4.3L 5.0L 5.7L
G 5.7L (LT9 ONLY)
1988 R/V/P 5.0L 5.7L
G 5.7L (LT9 ONLY)
The new pulley, P/N 6552402, is a single "V" groove high inertia pulley, which is heavier than the original "V" groove pulley. Refer to Section 1B of the appropriate service or unit repair manual for removal and installation procedures. For repairs to vehicles under warranty, use:
Labor Op: D4280
See Labor Time Guides for applicable times on individual model applications.
IMPORTANT: Prior to ordering the new pulley, visual verification should be made that the vehicle is equipped with the R4 compressor and is not serpentine belt driven.