LeSabre V6-3.8L VIN K (1996)
Hose/Line HVAC: All Technical Service Bulletins
A/C - Flutter or Moan Noise in A/C
File In Section: 1 - HVAC
Bulletin No.: 63-12-18
Date: January, 1997
Subject:
A/C System Flutter and/or Moan Noise with HVAC in A/C Mode
(Replace A/C Compressor Hose Assembly)
Models:
1996
Buick Park Avenue
1996-97
Buick LeSabre
1996
Oldsmobile Ninety Eight
1996-97
Oldsmobile Eighty Eight, LSS, Regency
1996-97
Pontiac Bonneville
with 3.8L Engine (VINs K, 1 - RPOs L36, L67)
Condition
Some owners may comment on a "fluttering" and/or "moan" noise during normal driving conditions with the HVAC system in the "A/C" mode. The
noises become evident under light acceleration or deceleration with the A/C compressor clutch engaged. The noises are evident in the glove box area of
the interior of the vehicle. The noises are most noticeable with the HVAC blower set on low speed with the engine operating between idle and 2500
RPM.
Cause
The "flutter" and/or "moan" noises are created by pressure pulses generated by the A/C compressor. The A/C compressor hose assembly transmits these
pressure pulses into the body of the vehicle through the HVAC module.
Correction
This condition may be corrected by replacing the A/C compressor hose assembly with a new compressor hose assembly, P/N 25665518. The new
compressor hose assembly contains an additional muffler located on the suction line (low pressure side of the A/C system). The additional muffler
dampens the compressor pressure pulses. Refer to Section 1B of the appropriate Service Manual for replacement procedure.
Parts Information
Parts are currently available from GMSPO.
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation
Description
Labor Time
Hoses and/or Lines
Refrigerant - Replace
Use published
D3088
(Compressor Suction
labor operation
& Discharge Hose
time
Assembly)
Add
Recover/Recharge
0.7 hr
A/C System