Rainier AWD L6-4.2L VIN S (2005)
Fan Clutch: All Technical Service Bulletins
Cooling System - Electro-Viscous Fan Clutch Operation
Bulletin No.: 06-06-02-003
Date: February 14, 2006
INFORMATION
Subject:
Operating Characteristics of the Electro-Viscous (EV) Fan Clutch and Diagnostic Tips for Cooling Fan Noise, Delayed Transmission Shifts and/or
Engine Revving Too High
Models:
2004-2006 Buick Rainier
2002-2006 Chevrolet TrailBlazer, TrailBlazer EXT
2006 Chevrolet TrailBlazer SS
2002-2006 GMC Envoy, Envoy XL
2004-2005 GMC Envoy XUV
2002-2004 Oldsmobile Bravada
2005-2006 Saab 9-7X
with 4.2L I-6, 5.3L V-8 or 6.0L V-8 Engine (VINs S, P, M, H - RPOs LL8, LM4, LH6, LS2)
Date/VIN Breakpoints for Vehicles with New EV Fan Clutch
Vehicles built after and including the Date or VIN Breakpoints listed in the table shown are equipped with the new electro-viscous (EV) fan clutch.
Vehicles of any model year listed in "Models Affected" with labor code J3390 (claimed after June 8, 2005) with P/N 15293048 in Claim History may
also be equipped with this new EV fan clutch.
After having service for poor HVAC performance and/or engine cooling performance, some vehicles may exhibit fan noise, delayed transmission shifts,
or the engine revving too high.
These conditions may be caused by expected operating characteristics of the new design electro-viscous (EV) fan clutch. This new design EV fan clutch
has been installed on production vehicles from the end of 2005 model year production (June 2005) and all 2006 model year vehicles. The new design EV
fan clutch may also be present on vehicles serviced with this new part per Corporate Bulletin Number 04-01-38-019A or for other service related
conditions.
The updated design of the electro-viscous (EV) fan clutch helps improve A/C performance but may also produce some additional fan engagement noise.
Important:
Unless a specific issue is identified by proper SI diagnosis, do NOT replace a fan clutch for fan noise.
