WATER LEAK FROM A/C MODULE RESEAL LOWER CASE PROCEDURE. Oldsmobile Custom Cruiser 1991

For 1990-2009 cars

# WATER LEAK FROM A/C MODULE RESEAL LOWER CASE PROCEDURE

#### SUBJECT: WATER LEAKS FROM AIR CONDITIONING MODULE (RESALE LOWER CASE) ------------------------------------------------------------

#### VEHICLES AFFECTED: 1991 B-CAR ----------

#### CONDITION:

----------

Water leaks from the A/C module lower evaporator case, when making right turns or rapid lane changes.

#### CAUSE:

------

Inadequate sealing of the lower evaporator case to the A/C module.

#### CORRECTION:

-----------

Remove the lower evaporator case and reseal with RTV sealant, using the following parts and service procedure as specified in the Service Manual.

Buick and Oldsmobile Chevrolet ------------------------ --------------------- Pages lBl-27 and lBl-28 Pages lBl-27 - lBl-29

#### SERVICE PARTS:

Quantity Part Number Part Name -------- ----------- ---------------------- 1 1052915 Silicone Sealant - RTY 1 ** 52453695 Filter - Foam

** There is enough material in this part to do several repair jobs.

The following optional RTV Sealer may be purchased locally.

1 59875 Loctite (R) Ultra Black-RTV

#### IMPORTANT: THE FOLLOWING STEPS ARE IN ADDITION TO THE SERVICE MANUAL PROCEDURE ON PAGES lBl-27-28 FOR OLDSMOBILE AND BUICK AND PAGES lBl-27-29 FOR CHEVROLET.

- After cleaning the lower evaporator case, remove the two (2) ridges as indicated in Figure 1, using a soldering iron, rotary file or etc.

- When doing Step 1. of the INSTALL OR CONNECT procedure in the Service Manual, fill the grooves of the lower evaporator case, as indicated in Figure 1 with the RTV sealant. Use enough sealant to leave a bead of 1.5 to 2.0 mm (.060 to .100) above the edges of the grooves. Allow the sealant to skin over before installing the case to the module.

- Cut a piece of the foam filter approximately one (1) inch by two and a half (2.5) inches long. Fold the piece of filter end to end and insert it into the groove, as indicated in Figure 1. Add a bead of RTV from side to side across the groove and the foam filter to hold the filter in place, as shown in the auxiliary view of Figure 1.

Continue on with the installation Steps as specified in the Service Manual.

Please update your Service Manuals accordingly.

"We believe this source and their equipment to be reliable. There may be additional manufacturers of such equipment. General Motors does not endorse, indicate any preference for or assume any responsibility for the products or equipment from this firm or for any such items which may be available from other sources".

Use the most applicable Labour Operation and Time from the Canadian Labour Time Guide.

03OOb/62-63

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.