A/C - Moan or Vibration With Compressor Running
89Pontiac12Bulletin Number: 89-6-51
Reference Number: 936508
Publish Date: 6/89
MOAN OR VIBRATION WITH A/C RUNNING
Subject: WITH SERPENTINE DRIVE (INSTALL SUPPORT BRACE)
Models
Affected: 1988 - 1989 FIREBIRD WITH 5.0L, 5.7L ENGINES
Some 1988 and early 89 Firebirds equipped with 5.0L or 5.7L engines (with serpentine accessory drive) may exhibit a moan or engine vibration when the air conditioning compressor is engaged. This condition may be corrected by the installation of a support brace to the A/C compressor mounting bracket.
Applicable part numbers are listed in the table below:
LO3 88-89 Firebird
QTY P/N PART NAME
1 10055888 Stud, A/C compressor
1 14100808 Stud, Intake manifold
1 10105289 Brace
2 14057004 Nut
LB9 and L98 88-89 Firebird
QTY P/N PART NAME
1 10055888 Stud, A/C compressor
1 11508476 Bolt, Intake manifold
1 10105292 Brace
1 14057004 Nut
Parts are currently available from GMSPO.
ILLUSTRATION 1:
Service Procedure:
L03 Applications:
1. Disconnect the negative battery cable.
2. Remove inboard A/C compressor bolt and install the longer of the two supplied studs, P/N 10055888 as shown in Illustration 1. Torque to 40-60 N-m.
3. Install the shorter of the two supplied studs, P/N 14100808 in the intake manifold boss as shown in Illustration 1. Torque to 20-30 N-m. On Firebird applications this hole is currently unused.)
4. Install brace P/N 10105289 supplied as shown in Illustration 1 (slotted end inboard) using two P/N 14057004 nuts. Torque to 26-40 N-m.
5. Reconnect the negative battery cable.
ILLUSTRATION 2:
LB9 and L98 Applications:
1. Disconnect the negative battery cable.
2. Remove inboard A/C compressor bolt and install supplied stud P/N 10055888 as shown in Illustration 2. Torque to 40-60 N-m.
3. Install brace P/N 10105292 supplied as shown in Illustration 2 (slotted end inboard). Attach the inboard end of the brace to the lower of the two open threaded holes located on the intake manifold just below the IAC motor using supplied bolt P/N 10508476. Torque to 16-24 N-m. Attach the outboard end of the brace onto the stud installed in step 2 using P/N 14057004 nut supplied. Torque to 26-40 N-m.
4. Reconnect the negative battery cable.
Labor Operation: T1437 L03 (VIN E) T1438 LB9 (VIN F) & L98 (VIN 8)
Labor Time : .3 hours (LO3) .2 hours (LB9 & L98)