whistling when windows down, annoying

rotoruter2001 · October 19, 2003

When I am driving my 2000 sierra on the highway and even still there on regular roads (less noticeable) there is a whistling sound. I have no bug guards or anything, it is all stock. Anyone know what is causing the lack of aerodynamics? I assume thats the problem. How can I fix this?

Shaners · October 19, 2003

Is your truck an excab? If so there is a problem with the rear quarter windows. If your truck is still under warranty then there is a TSB to cover the wind noise problem...

99-2door · October 19, 2003

Since you say it only happens with the windows down, it is probably the mirror. I had a truck that did that.

Shaners · October 19, 2003

Since you say it only happens with the windows down, it is probably the mirror. I had a truck that did that.

I missed the "Windows down" part somehow... Good chance that it is a mirror or another piece of body trim. Whistles are hard to find and usually involve having to tape off suspected areas and then test driving over and over.

rotoruter2001 · October 19, 2003

probably is the mirror, but what can I really do about that? I guess if it gets too bad I could get new ones or something but that seems kinda drastic. Guess its something I have to live with then.

Shaners · October 20, 2003

I'd check the chrome inserts on the backside of the mirror. Since they are removable it's a good possibillity that there is an edge sticking up enough to let the wind whistle... make sure they are good and flush.