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Subject: L36, L67, L26, L32, LA1, LX9, MN7, M15 Ticking or Knocking Type Noise Coming From Engine or Transmission Area (Replace Flexplate and Torque Converter) Models: 2005 Buick Park Avenue 2005-2006 Buick Allure (Canada Only), LaCrosse, LeSabre, Rendezvous, Terraza 2005 Chevrolet Impala, Monte Carlo, Venture 2005-2006 Chevrolet Malibu, Malibu Maxx, Uplander 2005 Pontiac Aztek, Bonneville 2005-2006 Pontiac Grand Prix, G6 GTP, Montana SV6 2006 Saturn Relay AWD with 3800 3.8L Series III V6 Engine (VINs K, 1, 2, 4, – RPOs L36, L67, L26, L32) or 3500 3.5L V6 Engine (VINs L, 8 RPO LX9) or 3400 3.4L V6 Engine (VIN E – RPO LA1) and Hydra- Matic(R) 4T65-E Transmission (RPOs MN7, M15) Some customers may comment on a ticking or knocking type noise coming from the engine or transmission area. Cause Typically the noise is caused by either the transmission rear dust cover contacting the flexplate (refer to Corporate Bulletin Number 05-06-01-028) or a cracked flexplate (sometimes also referred to as a flywheel). Correction With the vehicle raised and supported on a suitable hoist, verify that the noise is coming from the flexplate area. If the noise is present, follow the procedure below. If the noise is not coming from the flexplate area, refer to Lower Engine Noise, Regardless of Engine Speed in SI. Important: The following information only applies to vehicles with the noise coming from the flexplate area.

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Models: 2004-2006 Buick Rainier 2001-2006 Cadillac Escalade Models 2001-2006 Chevrolet Avalanche, Blazer, Silverado, Suburban, Tahoe, TrailBlazer Models 2001-2006 GMC Envoy, Jimmy, Sierra, Yukon Models 2001-2004 Oldsmobile Bravada 2005-2006 Saab 9-7X Some vehicles may experience a gradual coolant loss over time. A very low percentage of cylinder head(s) manufactured with an embossed Castech logo may develop a porosity crack in a very specific area. Inspect the cylinder head assembly to determine if the casting was manufactured by Castech. This can be accomplished by inspecting for their casting logo located on top of the intake port, under the rocker arm support rail and in the spring deck cavity portion of the cylinder head. Important: If the cylinder head(s) are Not a Castech casting, follow normal diagnostic procedures in SI to determine the cause of the coolant loss. Refer to the following illustrations on how to identify Castech casting and/or the very specific areas of the cylinder head(s) for a coolant leak from porosity.

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SUBJECT: MODELS: Heated Windshield Washer Module Short Circuit – Add Wire Harness 2006-2008 model year Buick Lucerne; Cadillac DTS; HUMMER H2 vehicles; 2007- 2008 model year Cadillac Escalade, Escalade ESV, Escalade EXT; Chevrolet Avalanche, Silverado, Suburban, Tahoe; GMC Acadia, Sierra, Yukon, Yukon XL; Saturn OUTLOOK vehicles; and 2008 model year Buick Enclave vehicles equipped with a heated washer fluid system. A short circuit on the printed circuit board for the washer fluid heater may overheat the control-circuit ground wire. This may cause other electrical malfunctions, create an odor, or cause smoke. In rare cases, it may cause a fire. PARTS INFORMATION No parts are required to pull the heated windshield washer fuse. When wire harnesses are available for ordering, a revised bulletin with ordering information will be sent to dealers/retailers. SERVICE PROCEDURE Important: Until wire harnesses become available, the following procedure allows dealers/retailers to remove the heated windshield wiper fuse, disabling the system. 2007-2008 Cadillac Escalade, Escalade EXT, Escalade ESV, 2007-2008 Chevrolet Avalanche, Silverado (GMT900), Suburban, Tahoe, 2007-2008 GMC Sierra (GMT900), Yukon and Yukon XL 1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in SI. Important: The underhood fuse block is located in the engine compartment on the driver side of the vehicle. Refer to Underhood Fuse Block in the Owner’s Manual for fuse information. 2. Locate the underhood bussed electrical center (UBEC). 3. Remove the UBEC cover and locate the 60 amp heated windshield washer fuse. Important: Remove the two relays (1) next to the fuse to gain access to the fuse. 4. Remove the 60 amp heated windshield washer fuse (2) using needle-nose pliers. 5. Store the 60 amp heated windshield washer fuse in the glove compartment. 6. Install the two relays (1) removed in Step 4. 7. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in SI. 8. Test the operation of the windshield wiper system. 8.1 Ensure the wiper system functions in low and high positions. 8.2 Verify that the windshield wiper/washer switch functions. The windshield wiper system should provide wiper fluid to the windshield. 8.3 Ensure that the heated windshield washer fluid system has been disabled. • Verify that the heated windshield washer switch does NOT flash. 9. Secure the UBEC cover on the UBEC. 10. Close the hood.

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Some vehicles equipped with the folding soft top may experience water accumulation in the foot wells due to the soft top drains becoming clogged with leaves and other debris. 1736a DRAIN COVER DRAIN VALVE ASSEMBLY As mass production changes: – A filter has been added to the drain valve assembly to prevent leaves or other foreign substance from clog- ging the drain. – Ribs have been added to the upper and lower valves of the drain valve assembly to prevent the valves (rub- ber flaps) from being forced out of position in the event compressed air is used to clear the drains from under the vehicle. – A foam urethane filter has been established for the drain cover. Vehicles with clogged drains should have the drain assemblies updated as described in the following repair pro- cedure, also included in this bulletin are maintenance tips for the customers to perform to ensure dependable operation of these drains. REPAIR PROCEDURE NOTE: Removal of the soft top is not required to perform the repair procedure. Illustrations in this bulletin are for component identification and location purposes only. 1. Verify customer concern. 2. Remove rear package trim according to Workshop Manual (section 09 -17 REAR PACKAGE TRIM REMOVAL/INSTALLATION) and related components, then remove the left and right side shelves according to Workshop Manual (section 09-17 SIDE SHELF REMOVAL/INSTALLATION). 3. Remove the seat belt retractors and covers according to Workshop Manual (section 08-11 SEAT BELT REMOVAL/INSTALLATION). – - TYPE A VEHICLES: Proceed to next step. TYPE B VEHICLES: Proceed to “TYPE B VEHICLES” under DRAIN VALVE REPLACEMENT. 4. Using seat belt retractor holes for access, remove the drain valve assemblies. DRAIN COVER FILTER INSTALLATION 1. Clean and degrease the drain cover assemblies.

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Models: 1982-2005 GM Passenger Cars and Light Duty Trucks 2006-2007 Buick Rainier 2006 Cadillac Escalade, Escalade ESV, Escalade EXT 2006 Chevrolet SSR 2006-2008 Chevrolet Avalanche, Colorado, Express, Silverado Classic, Silverado, Suburban, Tahoe, TrailBlazer 2006 GMC Yukon Denali, Yukon Denali XL 2006-2008 GMC Canyon, Envoy, Savana, Sierra Classic, Sierra, Yukon, Yukon XL 2006 Pontiac GTO 2006-2007 HUMMER H2 2006-2008 HUMMER H3 2006-2008 Saab 9-7X with 4L60, 4L60E, 4L65E or 4L70E Automatic Transmission (RPOs MD8, M30, M32, M33 or M70) Condition Some customers may comment that the vehicle has no movement when the transmission is shifted to DRIVE or THIRD position, but there is normal operation when it is shifted to SECOND, FIRST or REVERSE position. Cause This condition may be caused by a damaged forward sprag assembly (642). Correction When inspecting the sprag, it is important to test the sprag for proper operation by holding the outer race (644) with one hand while rotating the input sun gear (640) with the other hand. The sun gear should rotate only in the counterclockwise direction with the input sun gear facing upward. If the sprag rotates in both directions or will not rotate in either direction, the sprag elements should be inspected by removing one of the sprag reserved. retaining rings (643). Refer assembly © 2010 General Motors. All rights