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bgum

South Louisiana

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Posted: 03/14/22 12:19pm Link  |  Quote  |  Print  |  Notify Moderator

Door weather stripping would be my guess.

hornet28

Muskegon Mi.

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Posted: 03/14/22 12:27pm Link  |  Quote  |  Print  |  Notify Moderator

You're wondering if it's the cab lights, I've had more than one truck with cab lights and never experienced any whistling. One thing you could do is take a screwdriver and make sure all screws on those lights are tight





s1214

Vt

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Posted: 03/14/22 12:32pm Link  |  Quote  |  Print  |  Notify Moderator

2019 2500HD with the towing mirrors. At certain speeds and wind direction the mirrors whistle. If I extend the mirrors out a little, it stops.

BenK

SF BayArea

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Posted: 03/14/22 09:35pm Link  |  Quote  |  Print  |  Notify Moderator

With the hose method, have helped ID sources :

2 Windshield. One at the middke bottom. Other upper, pager corner

Several door, door window

One down on the floor where a drain plug wasn't reinstalled correctly

The hose should be about 3-4 foot long

Good luck


-Ben Picture of my rig
1996 GMC SLT Suburban 3/4 ton K3500/7.4L/4:1/+150Kmiles orig owner...
1980 Chevy Silverado C10/long bed/"BUILT" 5.7L/3:73/1 ton helper springs/+329Kmiles, bought it from dad...
1998 Mazda B2500 (1/2 ton) pickup, 2nd owner...
Praise Dyno Brake equiped and all have "nose bleed" braking!
Previous trucks/offroaders: 40's Jeep restored in mid 60's / 69 DuneBuggy (approx +1K lb: VW pan/200hpCorvair: eng, cam, dual carb'w velocity stacks'n 18" runners, 4spd transaxle) made myself from ground up / 1970 Toyota FJ40 / 1973 K5 Blazer (2dr Tahoe, 1 ton axles front/rear, +255K miles when sold it)...
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bucky

Raleigh metro

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Posted: 03/15/22 04:09am Link  |  Quote  |  Print  |  Notify Moderator

Sorry, misread something.


2005 Cummins 3500 2WD LB quad cab dually pulling a 2014 Blue Ridge 3025RL


PA12DRVR

Back in God's Country

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Posted: 03/16/22 10:06am Link  |  Quote  |  Print  |  Notify Moderator

"2019 2500HD with the towing mirrors. At certain speeds and wind direction the mirrors whistle. If I extend the mirrors out a little, it stops."

Several years older model with the same issue. Pull the mirrors out just a bit (.5" or so) and it stopped. 13 years later, apparently enough crud has built up that it doesn't happen anymore.

Had the same noise issue on a Toyota Tundra: fixed by putting a strip of black electrical tape over a seam in the mirror housing.


CRL
My RV is a 1946 PA-12
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HTElectrical

Las Vegas

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Posted: 03/16/22 07:34pm Link  |  Quote  |  Print  |  Notify Moderator

Check the trim around the front windshield. With my bug deflector on my truck it caused a whistle tapping noise at highway speed. I taped around window and outside, and filled slight gap with black caulk. No more noise.


2007 Duramax, Cognito 7"-9" Lift,


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