Whistling Truck

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.

"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.

Sorry, misread something.

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

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.

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

Door weather stripping would be my guess.

Thanks to everyone for responding. And to answer a few questions -

- I checked/double checked windows/doors/trim and everything is tightly closed and seems to be in order.
- Regarding antenna, I have the same thing I had on my previous truck, a stubby/short black antenna on the left side of the roof. No issues with this setup on previous truck. On new truck, however, the antenna is within an inch or two of one of the lights.
- It is not a diesel.
- No frost or ice. Nice, reasonably sunny 8 degrees (C).
- Change in heat/ac/fan does not impact the noise.

4x4ord - How was your friends windshield issue resolved? And how was it determined to be that issue?
Benk - will try the hose, but both me and passenger think it is coming from above the cab.

And to elaborate a bit. Driving down the road, as speed hits 80kmh and above, noise is heard. Due to terrain, if I slow, then later accelerate above 80-ish, the noise may not re-surface until the speed is closer to 90. Occasionally, there is no noise at theses speeds and sometimes it is louder (which is why I thought it might have something to do with which way the natural wind is blowing, but I dunno about that).

Problem with this whole thing is, once you know it is there, it is hard to ignore.

Marv

Take a length of garden hose

While someone else is driving

Hold one end close to your ear and move the other end around where you think the noise is coming from

IDing the source key in solving this problem

On a different direction, does it change depending on fan/heat/ac usage?