Cooling - Cold Start Fan Noise Higher Than Normal

9217chevy02

Number: 92-118-6B

Section: 6B

Date: FEB. 1992

Corporate Bulletin No.: 166203


ASE No.: A8


Subject:
COLD START FAN NOISE


Model and Year:
1988-92 S/T TRUCKS WITH 4.3L ENGINES


Owners of some 1988-1992 S/T vehicles equipped with a 4.3L engine (RPO LB4 or L35) and air conditioning (RPO C60) may experience higher than normal fan noise upon oold start up. This condition may be due to incorrect engagement of the fan clutch. The condition may be corrected by installing a revised fan clutch (P/N 15672779).

Vehicles built after the following VIN Breakpoints have the new fan clutch installed in production:

Plant VIN

Moraine 1GNDT13Z3N2151684
Shreveport 1GCCS19Z3N8156864
Pontiac West 1GNCS18Z2N0125676

SERVICE PROCEDURE:

Refer to section 6B1 "FAN/FAN CLUTCH REPLACEMENT" in the appropriate S/T Service Manual for removal and installation of the fan clutch.





IMPORTANT:
To maintain a balanced fan assembly, align the yellow paint mark on the fan clutch with the yellow paint mark on the water pump hub.


SERVICE PARTS INFORMATION

Part Number Description

15672779 Fan Clutch

Parts are currently available from GMSPO.


WARRANTY INFORMATION

For vehicles repaired under warranty use:

Labor Operation: J3390

Use applicable labor time guide for labor hours.