When driving @ 10 mph I hear a whistling noise coming from the area of the seam between the drivers door and the rear drivers side door. Let me say this first, it is not the turbo, I am very familiar with turbo spool up. It is the same noise you hear from your grandfathers old truck with the screw missing in the side mirror that whistles on the highway, but the difference is that I have no holes anywhere. The doors meet perfect, was never wrecked and never had any body work done. I have narrowed the spot down pretty good to somewhere where those 2 doors meet. Anybody else's truck do this?

 

My megacab has a slight whilstle only when the air is on and it is coming from the back of the truck near the rear window. Any input?

P.S. Sorry about jacking the thread FroneDaddy

 

Do you have a sliding rear window? Check and make sure it's shut/latched. Mine did that till I fingered out what it was

 

I have a similar problem on my 2006 Mega Cab but mine sounds like it is coming from the mirror. I have the flip up towing mirrors. I am debating on taking it back to the dealer because it is only a month old. I hate to take it back to the dealer for such a minor problem.

 

I have a sliding rear window, but it is power opperated.

 

I hear a strange whistle right next to my left ear coming from God only knows where that only happens when my AC is on high. It grates on my nerves[:@]

 

Try windows down then back up and see what happens, they might not be sealing all the way. What about AC on medium or low?

 

Check you cab vent, sounds like your pressurizing the cabin, turn it on recirculate and see if it quits making the noise

 

my truck also whistles but only when fan control is off and only at highway speeds(55-65).....i have a sunroof and a sliding glass but they seem to be sealing good.....sunroof doesnt leak or nothing, and sliding glass also latches well and seems to seal weel also...

 

mine whistles when it is on the selection that will circulate only the cab air. if i go to the selection above it, the noise dissappears.