TWIN LIFT-OFF PANEL WATER LEAK (DIAG./SERVICE PROCEDURE)

SUBJECT: TWIN LIFT-OFF PANEL (CC1) WATERLEAKS; (DIAGNOSED - WATER TESTED/ REPLACE WEATHERSTRIPS)

VEHICLES AFFECTED: 1982-91 "F" CAR

CONDITION:

---------- Some customers may comment about waterleaks on "F" style vehicles equipped with twin lift off hatch roof panels (CC1 option).

May include one or more of the following: - skips or voids in sealers on the roof weatherstrips - weatherstrip butt joints, improper contact - skips or voids in sealing of center "T" bar - improper door glass to weatherstrip contact

DIAGNOSIS: 1. Should be performed by watertesting the vehicle with the garnish moldings removed from the windshield pillar, lock pillar and lift off panel.

2. Should be performed by the technician doing the repairs.

3. Should refer to the chart included in this bulletin to aid in diagnosis.

CORRECTION:

----------- Repairs should be attempted only after the car has been properly watertested and diagnosed. It will not be necessary in all cases to replace weatherstrips.

The illustrations in this bulletin depict components on early style (1982-83) vehicles. The waterleak information remains correct regardless of year being repaired.

MATERIALS:

---------- FOR ADHESIVES/SEALANTS USE: 3M# 08011, AMERICAN/DOMINION SURE SEAL # BSSG-B OR GM # 12345097. FOR CAULKING MATERIAL USE 3M#08578 OR AMERICAN/DOMINION SURE SEAL BSC. Materials other than those listed above may be comparable, but only the material specified is recommended.

NOTES: PART NUMBERS: 1982 TO 1987, 1988 2ND Type and 1989 to 1991 Weatherstrip, lift off panel opening on body - 10198208 - 9 Weatherstrip, side roof rail on lift off glass - 10165500

PART NUMBERS: 1988 1ST Type Weatherstrip, lift off panel opening on body - 10064450 - 1 Weatherstrip, side roof rail on lift off glass - 10165500

NOTES: COMPONENT IDENTIFICATION

1. 1988 1st. design components have interlocking features on the opening weatherstrips and retainers. These components must not be intermixed with 1988 2nd. design and other years. The panel weatherstrip and retainers are common between various designs.

2. 1982 -1987, 1988 2nd. design and 1989-1991 are common in design.

3. The panel weatherstrip no longer attaches with screws to the panel at the butt joint locations, and must be glued into position.

4. The latest weatherstrips are silicone coated to reduce squeaking/ticking noises of glass to weatherstrips. If weatherstrip replacement is required, both (opening and panel) should be replaced as a set to obtain the best anti-squeak results and maintain appearance (gloss levels).

WATERLEAK DIAGNOSIS CHART

WATER ENTRY AT PROBABLE CAUSE(S) OF LEAK ILLUSTRATED --------------------------- ---------------------------- ------------- - Headliner - between twin - Skips or voids in sealing of - Figure #1 lift-off roof panels or body seams underneath twin at rear of roof. lift-offpanel center upper finishing molding.

- Outboard corners of - Skips or voids in the caulking - Figure #2 weatherstrip between or bridge material between the roof sheet metal and weatherstrip and roof sheet weatherstrip. metals

- Any area between roof - Skips or voids in weatherstrip - Figure #3 portion of weatherstrip adhesive and retainers or at - Figure #4 outboard ends of - Skips or voids in Secondary - Figure #5 retainers. Sealing

- Twin lift-off panel - Skips, voids or improperly - Figure #6 between outer plastic sealed weatherstrip retainers, - Figure #7 support panel and the weatherstrips or sealing sealing strip, weatherstrip strips. and/or weatherstrip retainer.

- Twin lift-off panel - Skips or voids in - Figure #7 between glass and outer urethane adhesive plastic support panel.

- Door glass to side - Misaligned, misadjusted twin - Figure #8 weatherstrips (especially lift-off panel weatherstrip at at the butt joint areas) butt Joints. - Misaligned, misadjusted - Refer to door glass. Body portion of Service Manual.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.