HVAC BLOWER MOTOR NOISE/ VIBRATION

SUBJECT: HVAC BLOWER MOTOR NOISE/VIBRATION (INSTALL NEW BLOWER MOTOR ASSEMBLY AND/OR I/P LOWER COMPARTMENT ACCESS HOLE COVER)

MODELS: 1995-96 BUICK REGAL 1995-96 OLDSMOBILE CUTLASS SUPREME 1994-96 PONTIAC GRAND PRIX

CONDITION:

SOME OWNERS MAY COMMENT ON NOISE AND/OR VIBRATION FROM THE HVAC BLOWER MOTOR.

CAUSE:

THIS NOISE/VIBRATION MAY BE DUE TO THE BLOWER MOTOR BEING OUT OF BALANCE, OR CONTENTS (I.E. TISSUES, PAPERS, ETC.) IN THE INSTRUMENT PANEL (I/P) LOWER COMPARTMENT BEING DRAWN INTO THE BLOWER MOTOR ASSEMBLY THROUGH THE RE-CIRCULATION DOOR DURING MAX A/C MODE.

CORRECTION:

IMPORTANT: 1996 MID-YEAR PRODUCTION FIX WILL HAVE THE FOLLOWING I/P LOWER COMPARTMENT ACCESS HOLE COVER INSTALLED. THEREFORE, THE INSTALLATION OF THE COVER WILL NOT BE UTILIZED IN THE FOLLOWING REPAIR PROCEDURE.

TO CORRECT THIS CONDITION, REMOVE BLOWER MOTOR AND INSPECT.

O IF NO OBJECTS ARE FOUND IN BLOWER MOTOR ASSEMBLY, REPLACE MOTOR WITH NEW INTERNALLY BALANCED ASSEMBLY FOLLOWING THE SERVICE MANUAL PROCEDURE AND INSTALL I/P LOWER COMPARTMENT ACCESS HOLE COVER AS DESCRIBED IN THE REPAIR PROCEDURE.

O IF OBJECTS ARE FOUND IN BLOWER MOTOR ASSEMBLY, REMOVE THE OBJECT, CHECK FAN BLADES FOR DAMAGE, REINSTALL MOTOR AND TEST.

O IF BLOWER MOTOR IS QUIET, INSTALL I/P LOWER COMPARTMENT ACCESS HOLE COVER AS DESCRIBED IN THE REPAIR PROCEDURE.

O IF BLOWER MOTOR IS STILL NOISY, REPLACE MOTOR WITH NEW INTERNALLY BALANCED ASSEMBLY FOLLOWING THE SERVICE MANUAL PROCEDURE AND INSTALL I/P LOWER COMPARTMENT ACCESS HOLE COVER AS DESCRIBED IN THE REPAIR PROCEDURE.

REPAIR PROCEDURE -

(FOR I/P LOWER COMPARTMENT ACCESS HOLE COVER INSTALLATION)

1. REMOVE RIGHT SIDE INSTRUMENT PANEL INSULATOR PANEL (HUSH PANEL).

2. REMOVE I/P LOWER COMPARTMENT ASSEMBLY (GLOVE BOX) FOLLOWING THE SERVICE MANUAL PROCEDURE AND PLACE ON A PROTECTED SURFACE.

3. CUT OUT TEMPLATE (FIGURE 1). LOCATE TEMPLATE OFF THE SQUARE INDENTATION ON THE TOP SURFACE OF I/P LOWER COMPARTMENT ASSEMBLY (FIGURE 2).

4. DRILL 6.5MM (1/4 INCH) DIAMETER HOLES AS SHOWN ON TEMPLATE (FIGURE 2).

5. REMOVE TWO (2) SCREWS AT TOP CORNERS OF I/P LOWER COMPARTMENT OPENING (FIGURE 4).

6. INSTALL I/P LOWER COMPARTMENT ACCESS HOLE COVER. THIS CAN BE DONE BY APPLYING HAND PRESSURE TO THE FOAM ON THE COVER AND SLOWLY COMPRESS FLAT AND HOLD. THE FOAM WILL RETAIN A FLAT SHAPE LONG ENOUGH TO BE INSTALLED THE FIRST TIME IT IS CRUSHED. IF MORE ATTEMPTS ARE MADE, THE FOAM WILL RECOVER FASTER MAKING IT MORE DIFFICULT TO INSTALL. WITH THE CLOTH SIDE OF THE COVER FACING THE PASSENGER COMPARTMENT, ALIGN THE CUT OUT TO THE RIGHT UPPER CORNER OF THE I/P LOWER COMPARTMENT OPENING (FIGURE 4). INSERT THE FOAM AND CLOTH EDGE BETWEEN TOP FORWARD EDGE OF I/P LOWER COMPARTMENT OPENING AND HINGE PILLAR TIE BAR (FIGURE 3) WHILE PUSHING REARWARD IN VEHICLE. POSITION FAR ENOUGH REARWARD TO CAPTURE FOAM ON OTHER SIDE OF PASSENGER SIDE SIR MODULE.

7. RE-INSTALL TWO SCREWS AT TOP CORNERS OF LOWER COMPARTMENT OPENING (FIGURE 4).

8. RE-INSTALL I/P LOWER COMPARTMENT ASSEMBLY WITH ACCESS HOLE COVER HANGING DOWN INSIDE LOWER COMPARTMENT.

9. INSERT ACCESS HOLE COVER ATTACHMENTS TWO (2) FROM INSIDE LOWER COMPARTMENT INTO PREVIOUSLY DRILLED HOLES. ONCE INSTALLED, CLOSE AND CYCLE I/P LOWER COMPARTMENT. THE ACCESS HOLE COVER WILL BE PULLED FORWARD AND ADJUST TO THE OPENING.

PARTS INFORMATION:

I/P LOWER COMPARTMENT ACCESS HOLE COVER P/N 10288630 BLOWER MOTOR ASSEMBLY P/N 52473135

PARTS ARE EXPECTED TO BE AVAILABLE ON SEPTEMBER 23, 1996.

WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OPERATION LABOR NUMBER DESCRIPTION TIME =============== =========== =====

D1322 R+R BLOWER MOTOR (INCLUDES INSPECT, USE PUBLISHED RE-INSTALL, TEST FOR VIBRATION) LABOR TIME.

ADD: INSTALL I/P LOWER COMPARTMENT ACCESS 0.5 HR HOLE COVER

ADD: REPLACE BLOWER MOTOR 0.4 HR

FIGURES: 04 ATTACHMENTS: 00

FIGURE 1: 1. DRILL LOCATION TEMPLATE (CUT ALONG DOTTED LINE) 2. TOP/FRONT 3. CUT-OUT

FIGURE 2: 1. DRILL LOCATION TEMPLATE 2. TOP/FRONT 3. DRILL 1/4 IN. DIA. (6.5MM) 4. LOWER COMPARTMENT TOP SURFACE

FIGURE 3: 1. I/P LOWER COMPARTMENT 2. INSTRUMENT PANEL 3. PASSENGER SIDE "SIR" MODULE 4. BODY HINGE PILLAR TIE BAR 5. COVER ASM. I/P COMPARTMENT ACCESS HOLE (SHOWN IN PLACE)

FIGURE 4: 1. SCREWS (2) 2. INSTRUMENT PANEL 3. LOWER COMPARTMENT ACCESS HOLE COVER

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.

COPYRIGHT 1996 GENERAL MOTORS CORPORATION. ALL RIGHTS RESERVED.