A/C - Vibration/Noise Reissue
88chevy12REISSUE
Number: 88-82-1B
Section: 1B
Date: March, 1988
Subject: AIR CONDITIONING NOISE/VIBRATION
Mode and Year: 1988 C/K TRUCKS WITH AIR CONDITIONING
AND 4.3L, 5.0L AND 5.7L, ENGINES (VIN CODES Z, H, AND K)
TO: ALL CHEVROLET DEALERS
This bulletin is being reissued at this time of year to help Chevrolet dealerships avoid misdiagnosis and possible replacement of good A/C compressors.
Some 1988 C/K trucks with 4.3L, 5.0L and 5.7L engines may exhibit a noise/vibration when the air conditioning is engaged. This noise/vibration is the result of a resonance set up in the serpentine accessory drive system with air conditioning on. If this condition is experienced on 1988 C/K trucks built before the VIN breakpoints listed below, install the following kits. Installation instructions are included with the kits.
Part Number Engine
10085731 4.3L V-6 With A/C
10085730 5.0L/5.7L V-8 With A/C
All 1988 C/K trucks built after the following VIN breakpoints (last 7 digits) have had the above kits installed at the assembly plants.
Oshawa #2 Chevrolet 1178198
Fort Wayne Chevrolet Z158598
Pontiac East Chevrolet E142329
V-8 Labor Operation Number: T7415
V-6 Labor Operation Number: T7420
V-8 Labor Time: .7 Hr. (+ .2 Hr.w/Air Pump)
V-6 Labor Time: .8 Hr. (+ .2 Hr.w/Air Pump)