Trans Sport V6-3800 3.8L (1994)
Compressor Clutch: All Technical Service Bulletins
A/C Compressor - Moan Noise at 2100 RPM
File In Section: 1 - HVAC
Bulletin No.: 63-12-12
Date: September, 1996
Subject:
A/C Compressor "Moan" Noise at 2100 RPM
(Replace A/C Compressor Clutch Plate and Hub Assembly)
Models:
1993-95 Chevrolet Lumina APV
1993-95 Oldsmobile Silhouette
1993-95 Pontiac Trans Sport
with 3.8L Engine (VIN L - RPO L27)
Condition
Some owners may comment on a "moan" type noise that becomes evident under light acceleration when the A/C compressor clutch is engaged. This
condition is prevalent when driving at or around 2100 RPM and more noticeable in high ambient temperatures and/or humidity.
Cause
The "moan" noise may be created by compressor pulses which set up a system resonance.
Correction
Replace the A/C compressor clutch plate and hub assembly, P/N 6553791, as identified in the procedure in Section 1D2 of the Service Manual. The
replacement of the clutch plate and hub assembly will improve the condition considerably; however, because of various build configurations which are
critical to system moan, it may not totally remove all of the moan on some vehicles.
Parts Information
P/N
Description
Quantity
6553791
Clutch Driver, Compressor
1
Parts are currently available from GMSPO.
Warranty Information
For vehicles repaired under warranty, use:
Labor
Operation
Description
Labor Time
Clutch Plate and
Hub Assembly,
Use published
D4240
Compressor -
labor operation
Replace
time.