Noise in dashbard

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Apr 7, 2011 | 10:13 AM

Phil084LT

Thread Starter

4th Gear

Joined: Apr 2011

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Noise in dashbard

VicPerkins and I have the same issue: 08 Corvette coupe experiences a humming/vibration type sound coming from passenger side dashboard, it seems to activate at higher speeds after driving for awhile. Are there there any motor or hydraulic type components behind the passenger dash board that could cause this intermittent sound? The sound/vibration kicks in at around 55 MPH.

Last edited by Phil084LT; Apr 7, 2011 at 10:14 AM. Reason: typos

Apr 7, 2011 | 11:24 AM

RicK T

Team Owner

Joined: Sep 2005

Posts: 20,352

Likes: 568

From: Ventura County, Calif

May be the plastic cowl molding vibrating against the glass. Try taping the molding to the glass and go for a drive. Here's a typical thread:

http://forums.corvetteforum.com/c6-c...ield-help.html

Apr 7, 2011 | 12:33 PM

Phil084LT

Thread Starter

4th Gear

Joined: Apr 2011

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The noise/vibration isn't coming from the windsheild area. It appears to be centered behind the navigation and air vent area.

Apr 7, 2011 | 12:41 PM

JayplaySS2

Melting Slicks

Joined: Jul 2007

Posts: 2,052

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I ended up removing the temp sensor (little electric fan motor) located behind the console next to the ignition button, you'll see the vent. My noise was a buzzing sound that drove me nuts.

Not sure if that's your problem but give it a look-

If not, good luck, I hate noises too-

Apr 7, 2011 | 12:51 PM

AirBusPilot

Le Mans Master

Joined: Aug 2008

Posts: 5,578

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From: Austin TX

Quote:

Originally Posted by Phil084LT

The noise/vibration isn't coming from the windsheild area. It appears to be centered behind the navigation and air vent area.

Tape the windshield. I had the exact noise and I swore it was a fan behind the vents. Once i discovered it was the cowl, I used a small amount of clear silicone sealer to hold it down. No more buzzing.

Apr 7, 2011 | 10:44 PM

CGZO6

Melting Slicks

Joined: Sep 2009

Posts: 2,028

Likes: 357

I think I've had the same cown vib issue. Haven't heard it lately, I think it stopped due to the warmer temps. The plastic cowl probably shrinks/expands with temp changes. At certain temps it rattles against base of windshield.

Airbus suggested the best fix, if your skilled with a caulk gun and don't make a mess.

Apr 7, 2011 | 11:30 PM

Mike's LS3

Safety Car

Joined: Nov 2007

Posts: 4,435

Likes: 874

From: Bay Area CA

Quote:

Originally Posted by Phil084LT

I had the same issue on my 08 just 3 days before the bumper to bumper warranty expired. The cowl trim becomes deformed and lifts off the windshield causing air to enter between the glass and cowl trim. It is like blowing on the edge of a few pieces of paper, it will cause a vibration sound. Try Airbus's suggestion by taping the plastic cowl to the windshield and see if it goes away. If is does, you have solved the problem. If you are still under the warranty have GM replace it, if not replace the cowl trim yourself of apply a clear sealant between the cowl trim and windshield.

Last edited by Mike's LS3; Apr 7, 2011 at 11:37 PM.

Nov 14, 2011 | 08:27 PM

Johns67

Advanced

Joined: Oct 2011

Posts: 71

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From: Gilroy CA

My 08 has the same issue the cowl lip at the windshield has lifted about 1/4" on the driver side as well as on the passenger side except the lip on the passenger side is split length wise along the seam about
6".

Put tape on the windshield cowl interface and test drove, no more buzz at freeway speeds.

I ordered a new cowl today $78.00, dealer wants $89.00 to install.

Any body know whats involved to diy. I'd like to put it on this weekend.