COOLANT LEAK NEAR THE THROTTLE BODY. Buick Park Avenue 1994

SUBJECT: COOLANT LEAK NEAR THE THROTTLE BODY (REPLACE THROTTLE BODY SEAL)

MODELS: 1993-95 BUICK LESABRE, PARK AVENUE, REGAL 1993-95 CHEVROLET LUMINA APV 1993-95 OLDSMOBILE EIGHTY EIGHT, NINETY EIGHT, SILHOUETTE 1993-95 PONTIAC BONNEVILLE, TRANS SPORT WITH 3800 ENGINE (VIN L - RPO L27)

CONDITION:

SOME OWNERS MAY COMMENT ABOUT AN ENGINE COOLANT LEAK THAT IS TRACEABLE TO THE VICINITY OF THE THROTTLE BODY ASSEMBLY.

CAUSE:

THE THROTTLE BODY-TO-UPPER INTAKE MANIFOLD SEAL MAY NOT BE SUFFICIENTLY COMPRESSED TO PREVENT COOLANT FROM LEAKING. THIS CONDITION WILL MOST LIKELY BE MORE PREVALENT DURING WINTER WEATHER.

CORRECTION:

REPLACE THE CURRENT THROTTLE BODY SEAL WITH A SERVICE SEAL. THE SERVICE SEAL HAS A LARGER CROSS SECTIONAL AREA (THICKER). A SERVICE KIT CONSISTING OF ONE THROTTLE BODY SEAL, THREE SLEEVE NUTS AND TWO STUDS HAS BEEN DEVELOPED. USE THE NEW SLEEVE NUTS AND STUDS IF THE OLD PARTS BECOME DAMAGED DURING SERVICING.

SERVICE INFORMATION:

TO DIAGNOSE THE CONDITION, THE TECHNICIAN SHOULD COLD START THE VEHICLE UNDER THE SAME OUTDOOR TEMPERATURE CONDITIONS AS THE CUSTOMER DOES (ENGINE COOLANT TEMPERATURE APPROXIMATELY SAME AS OUTSIDE AIR TEMPERATURE). IF THE VEHICLE IS BROUGHT INSIDE THE REPAIR FACILITY FOR A COLD START, THE LEAK MAY NOT BE PRESENT DUE TO WARMER INSIDE TEMPERATURES.

1. PARK THE VEHICLE. 2. WHEN COLD STARTING - SET THE PARKING BRAKE, START THE ENGINE AND RAISE THE HOOD ON THE VEHICLE. 3. LEAVE THE TRANSMISSION IN PARK. 4. FROM UNDER THE HOOD, OPERATE THE THROTTLE LEVER TO INCREASE ENGINE SPEED TO ABOUT 2000 RPM. 5. CHECK FOR COOLANT LEAKS AROUND THE BOTTOM OF THE THROTTLE BODY WHERE IT ATTACHES TO THE UPPER INTAKE MANIFOLD. 8. IF A COOLANT LEAK IS DETECTED IN THIS AREA, REPLACE THE THROTTLE BODY SEAL WITH A SERVICE SEAL.

SERVICE PROCEDURE:

REFER TO SECTION 6E3-C2 IN THE APPROPRIATE SERVICE MANUAL.

PARTS INFORMATION:

THROTTLE BODY-TO-INTAKE SEAL KIT: 17113264

PARTS ARE EXPECTED TO BE AVAILABLE ON APRIL 24, 1995.

WARRANTY INFORMATION:

LABOR OPERATION DESCRIPTION LABOR TIME J5485 R+R THROTTLE BODY SEAL USE PUBLISHED LABOR TIME ADD R+R 1 - 2 SLEEVE NUTS AND STUDS 0.2 HRS

FIGURES: 0 ATTACHMENTS: 0

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.