For 1990-2009 cars

# WHISTLE NOISE FROM HVAC (INSTALL SEAL)

#### SUBJECT: WHISTLE NOISE FROM HVAC WHEN COMING OFF FULL HOT POSITION (INSTALL SEAL)

#### MODELS: 1991-94 BUICK LESABRE AND PARK AVENUE 1991-92 CADILLAC FLEETWOOD 1991-94 CADILLAC DEVILLE 1992-94 CADILLAC ELDORADO AND SEVILLE 1994 CADILLAC CONCOURS 1991-94 OLDSMOBILE EIGHTY EIGHT AND NINETY EIGHT 1991-94 PONTIAC BONNEVILLE

#### CONDITION:

SOME OWNERS MAY COMMENT ON A WHISTLE NOISE WHEN THE TEMPERATURE MIX DOOR STARTS TO MOVE AWAY FROM THE FULL HOT POSITION.

#### CAUSE:

THE TEMPERATURE DOOR SEAL DOES NOT COME OFF ITS SEAT EVENLY, CAUSING A SMALL "LEAK". THE WHISTLE IS ORIGINATING THROUGH THIS LEAK.

#### CORRECTION:

A FOAM SEAL, P/N 52470996, NEEDS TO BE INSTALLED BEHIND THE TEMPERATURE DOOR TO PREVENT WHISTLE. TO REPAIR THIS CONDITION, PERFORM THE FOLLOWING PROCEDURE:

1. REFER TO APPROPRIATE SERVICE MANUAL TO REMOVE HEATER CORE. 2. ONCE HEATER CORE IS REMOVED, IDENTIFY THE TEMPERATURE DOOR SEAL AND THE AREA WHERE THE NEW SEAL IS TO BE INSTALLED (REFER TO FIGURE 1). 3. PLACE DUCT TAPE ON TOP OF TEMPERATURE DOOR, PULL UPPER LIP OF SEAL DOWN AND TOWARD PASSENGER SIDE OF VEHICLE, THEN STICK TAPE TO DOOR TO POSITION SEAL TO GAIN ACCESS TO AREA WHERE NEW SEAL WILL BE INSTALLED (REFER TO FIGURE 2). 4. THOROUGHLY CLEAN AREA WHERE SEAL IS TO BE INSTALLED. THERE SHOULD BE NO OIL, DUST OR DEBRIS IN THIS AREA.

#### IMPORTANT: WHEN INSTALLING SEAL, BE SURE TO ALIGN THE TAPERED EDGE TOWARD THE HINGE SIDE OF THE TEMPERATURE DOOR.

5. TO INSTALL SEAL, PLACE DOUBLE SIDED TAPE (AVAILABLE LOCALLY) ON FINGER, THEN PLACE PROPERLY ORIENTED SEAL ON FINGER (STICKY SIDE OUT). ONCE SEAL IS ON FINGER, PLACE SEAL THROUGH OPENING ABOVE THE TEMPERATURE DOOR. 6. REMOVE DUCT TAPE FROM TEMPERATURE DOOR.

#### IMPORTANT: AFTER INSTALLATION, VERIFY THAT THE SEAL IS PROPERLY POSITIONED SO THAT THE TAPERED EDGE IS TOUCHING THE TAPERED PORTION OF THE HEATER CASE. A MIRROR MAY BE USED TO VERIFY INSTALLATION.

ALSO VERIFY THAT THE SEAL DOES NOT SCRAPE ON THE TEMPERATURE DOOR.

7. FOLLOW SERVICE MANUAL PROCEDURES TO INSTALL HEATER CORE AND PROGRAMMER.

PARTS ARE EXPECTED TO BE AVAILABLE ON OCTOBER 3, 1994.

#### WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OPERATION NUMBER: D2802 (FOR 1991-94 BUICK, OLDS, PONTIAC C/H) D2808 (FOR 1991-93 CADILLAC C) D2808 (FOR 1994 CADILLAC E/K) D2828 (FOR 1992-93 CADILLAC E/K) USE PUBLISHED LABOR OPERATION TIME.

FIGURES: 2

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 1994 GENERAL MOTORS CORPORATION. ALL RIGHTS RESERVED.