Thursday, 27 May 2010 15:41

Was this Noise Caused by the Repair?

Written by Dan Espersen

Almost everyone in the collision industry has experienced this scenario: You repair a vehicle – in this case, a Chevrolet® Suburban® – to the highest standard possible. The owner takes delivery and drives off smiling. A few days later, he brings it back with a noise that he insists was not present before the repair. He describes a buzzing noise from the right-hand fender.

What do you do? If you have OE information, including technical service bulletins (TSBs) available to you, you do a little research. Technical service bulletins are published by automobile manufacturers primarily to identify factory defects, safety related problems and recognized issues for which the manufacturer has published a solution.

As it turns out, the General Motors® had already issued a TSB describing the exact situation I just described.

Body - Buzz/Rattle From R/H Front Fender on Acceleration
Loud Buzz or Rattle Noise from Right Front Fender Area on Moderate to Hard Acceleration and/or Braking Torquing Around 1800-2000 RPMs or Before 1-2 or 2-3 Shift (Install Closed Cell Foam to Right Front Fender)
2007-2008 Cadillac® Escalade®, Escalade ESV®, Escalade EXT®
2007-2008 Chevrolet® Avalanche®, Silverado®, Suburban®, Tahoe®
2007-2008 GMC® Sierra®, Yukon®, Yukon Denali®


Some customers may comment on a buzz or rattle noise from the right front fender area on moderate to hard acceleration and/or brake torquing around 1800-2000 RPMs or just before the 1-2 or 2-3 shift.
The radiator surge tank and/or the inner wheelhouse liner may be contacting the right fender.

Always refer to ALLDATA® Collision for safety procedures, identification of material types, recommended refinish materials, and removal and installation procedures. Always refer to the vehicle manufacturer for questions relating to applicable or non-applicable warranty repair information.
Install closed cell foam to the right front fender using the steps below:
Verify the condition.
Open the hood.
Remove the air cleaner assembly.
Remove the four bolts from the air cleaner adapter bracket.
Remove the air cleaner adapter bracket.
Remove the plastic retainer (1) from the right front center inner wheelhouse liner (Figure 1). Cut a piece of closed cell foam, P/N P46510, to 32 mm (1-1/4 in) length.
Make a hole in the center of the foam with a 6 mm (1/4 in) drill bit by hand.
Install the piece of foam between the wheelhouse liner and the fender from inside the engine compartment at the removed retainer location.

Tip: Line up the hole in the foam with the hole in the fender and wheelhouse liner.
Install the plastic retainer into the right front wheelhouse liner, foam (1) and the fender (Figure 2).
Mark the two locations on the right fender where the radiator surge tank mounting tabs contact the fender, (Figure 3). Remove the nut and bolt from the radiator surge tank.
Do Not disconnect any hoses or drain the coolant.
Remove the radiator surge tank from the fender retaining slot by pulling upward.
Reposition the radiator surge tank away from the fender.
Cut three pieces of closed cell foam, P/N P4615, to 50 mm (2 in) lengths.
Clean the area above the marks on the right front fender with glass cleaner.
Start by installing the center piece of foam vertically at the hole (1) in the fender 20 mm (3/4 in) above the right fender retaining slot (Figure 4).
When attaching the foam, try to keep the foam uniform and even across the top for appearance purposes.
Attach the other two pieces of foam vertically with no gaps to the left side and right side of the center piece of foam as shown above (Figure 5).

Tip: Use a plastic putty scraper to help prevent the rolling of the foam when installing the radiator surge tank (Figure 6). Install the radiator surge tank plastic tab into the matching retaining slot inside the right inner fender.
Install the air cleaner adapter bracket while aligning and centering the front mounting hole for the radiator surge tank. Install the four bolts for the air cleaner adapter bracket and tighten.
Tighten the bolts to 10 N.m (89 lb in).
Install the nut and bolt securing the radiator surge tank.
Tighten the nut and bolt.
Tighten the nut and bolt to 10 N.m (89 lb in).
Install the air cleaner assembly.
Close the hood.
Verify that the condition has been corrected.

Written by Dan Espersen, ALLDATA Collision Program Manager. Dan is a Gold Pin Member of the Collision Industry Conference (CIC) and holds an AA Degree in Automotive Technology. He has 17 years of experience in the collision industry and 17 years of experience in the automotive industry.

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General Motors, Cadillac, Escalade, Escalade ESV, Escalade EXT, Chevrolet, Avalanche, Silverado, Suburban, Tahoe, GMC Sierra, Yukon and Yukon Denali are registered trademark names and model designations of General Motors. All trademark names and model designations are being used solely for reference and application purposes.