For 1990-2009 cars

# POOR HEATER PERFORMANCE (RESEAL HEATER CORE)

#### SUBJECT: POOR HEATER PERFORMANCE (RESEAL HEATER CORE TO HEATER CASE SEAL)

#### MODELS: 1993-94 CHEVROLET CAMARO 1993-94 PONTIAC FIREBIRD

#### CONDITIONS:

CUSTOMERS MAY COMMENT ON POOR HEATER PERFORMANCE.

#### CAUSE:

THE HEATER CORE TO HEATER CASE SEAL MAY BECOME LOOSE, ALLOWING COOL AIR TO BLOW BY THE HEATER CORE INSTEAD OF PASSING THROUGH IT. SEE FIGURE 1.

#### CORRECTION:

THE HEATER CORE TO HEATER CASE SEAL MAY BE RE-ATTACHED BY THE FOLLOWING PROCEDURE:

1. REMOVE RH SIDE SOUND INSULATOR ASSEMBLY. REFER TO SECTION 8C OF THE SERVICE MANUAL FOR PROCEDURE.

2. REMOVE INSTRUMENT PANEL COMPARTMENT DOOR (GLOVE BOX). REFER TO SECTION 8C OF THE SERVICE MANUAL FOR PROCEDURE.

3. UNSNAP EVAPORATOR TEMPERATURE MODULE AND PULL HEATER CORE COVER OUT AND DOWN.

4. VERIFY THAT SEAL HAS PULLED AWAY FROM HEATER CASE BY VISUALLY INSPECTING. SEE FIGURE 1.

5. REMOVE HEATER CORE CLAMP.

6. GLUE DOWN SEAL AND INSTALL AN ALUMINUM OR PLASTIC SEAL RETENTION STRIP APPROXIMATELY 6-1/2" X 3/4" (165MM X 19MM) TO HOLD SEAL IN PLACE. THICKNESS OF STRIP CAN RANGE FROM 1/16" TO 3/16" (1.6MM - 4.7MM). SEE FIGURE 2.

TO GLUE SEAL IN PLACE, USE GM WEATHERSTRIP ADHESIVE P/N 12345096 OR 3M ADHESIVE (3M P/N 080-11) OR EQUIVALENT.

7. HOLD SEAL RETENTION STRIP IN PLACE AND REINSTALL HEATER CORE CLAMP.

#### NOTE: IT IS IMPORTANT THAT A STEEL STRIP NOT BE USED AS IT MAY CAUSE CORROSION PROBLEMS.

8. INSTALL HEATER CORE COVER.

#### NOTE: ON SOME 1993 MODELS, IT MAY BE NECESSARY TO MODIFY THE COVER TO EASE COVER INSTALLATION. IF NECESSARY TO MODIFY, TRIM HEATER CORE COVER UPPER RIGHT SIDE CORNER TOP FLANGE APPROXIMATELY 0.6" (15MM). HEATER CORE COVER HAS A TONGUE AND GROOVE SEAL AND MUST BE ENGAGED TO SEAL PROPERLY. SEE FIGURE 3.

9. INSTALL RH SIDE SOUND INSULATOR ASSEMBLY.

10. INSTALL INSTRUMENT PANEL COMPARTMENT DOOR (GLOVE BOX).

#### WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY, USE: LABOR OPERATION: D2812 LABOR TIME: 0.3 HR.

FIGURES: 3

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.