Century L4-2.2L VIN 4 (1994)
Sunroof / Moonroof: All Technical Service Bulletins
Noisy/Rattles
Comments of Lifter Arms Rattle, Glass Panel Rattles, Excessive Vertical Play at Rear of Glass
Rattles and looseness at the rear of the glass panel when in the closed position may be caused by looseness in the lifter arm linkages. This condition can
be caused by miss positioned or improperly bent glass panel mounting brackets. If pushing up on the rear of the glass panel results in more than 1/8" of
movement or causes a clunking" noise, use the following procedure to reduce glass panel movement:
1.
Remove the glass panel and turn upside down on a clean, non-abrasive surface.
2.
Using pliers or channel locks, bend the six panel attaching brackets so they are 90° to the glass panel surface. Refer to Figure 2.
3.
Reinstall and adjust the glass panel.
Operate the sunroof to ensure proper functioning. If the mounting brackets are bent too far during the above procedure, two conditions may occur: 1) the
sunroof may operate slowly due to increased friction; 2) the track may interfere with the lifter arms when closing from vent position causing a loud
popping noise. To repair these conditions use the following procedure:
1.
Readjust the center mounting tabs slightly outboard. This can be accomplished without removing the glass by applying force to the screw head
from the inside. Position a dull punch on the screw head and tap with a hammer. Readjustment will eliminate the interference condition and should
relieve some of the friction.
2.
Operate the sunroof to verify that the condition has been eliminated.
3.
If the glass panel continues to move slowly, make a slight outboard adjustment to the front and rear mounting tabs on each side of the panel.
For warranty purposes use:
Labor Operation
Labor Time
T6349
0.5 hr
Recurring Glass Panel Rattles and/or Looseness
When glass panel rattles or looseness recurs over time, perform the following steps only on the vehicles specified for each procedure. Both of the
following corrections have been implemented into production vehicles during the months noted. These changes have been made to limit movement of the
lifter arm when the glass panel is closed.
Vehicles Built Prior to October, 1989 without Vinyl Tops - In October, 1989 the lifter arm guide pin slot was reduced to prevent looseness of the glass
panel linkage when the glass is closed. The new lifter arms were implemented on Sevilles at VIN LU803080 and on Eldorados at VIN LU604077.
Oldsmobile Toronados VIN 302169 and Buick Rivieras VIN 403851.
On vehicles built prior to the breakpoint, replace the lifter arms using the part numbers listed below. Reference the appropriate Service Information
Manual, Section 10-9, for removal and installation procedure.
Lifter Arm
P/N
Left
12504123
