Bonneville V6-3800 3.8L VIN L SFI (1995)
Throttle Body: Customer Interest
Engine - Coolant Leak Near the Throttle Body
FILE IN SECTION: 6 - Engine
BULLETIN NO.: 57-61-04
DATE: May, 1995
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.
6.
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 currently available from GMSPO.
WARRANTY INFORMATION
Labor
Operation
Description
Labor Time
