Tough to say without riding in it/hearing it, but it will be tough to find a vehicle that makes more wind noise than a defender. It has the aerodynamics of a chest freezer.

 

I hear you. I have an old Santana as well, but that doesn’t have a “whistle“ like this (although it’s tough to hear anything in that over the sound of the diesel). I was more curious to see If anyone had any specific experience with it on the NAS defender because of the roll bar. I can try to record the noise and post if I can get a good video. Thanks.

 

I wouldn’t label the wind noise as a whistle, though cutting corners when securing the roof can cause all sorts of noises to test one’s sanity. My experiences with whistling noises mostly turned out to be loose bolts, and made themselves evident by increasing when the gas was applied.

 

Pretty common to get a whistling noise from vacuum leaks, often from valve covers who's bolts are loose or gaskets are done. But as ARosen points out, these are usually RPM dependent, and can often be heard at a standstill/idle..

 

Diesel?


Diesel.....

 

Are there any modifications on the front of the vehicle or is it more of a standard NAS original set-up? Photos of front of truck?

 

Here are a couple photos of the front. No real mods but I do know the previous owner replaced some panels and the windshield

 

My 110 started whistling as soon as I replaced the driver's side door seal. I've tried pressing in the seal inch by inch but cannot fix the very clear whistle at higher speeds. At this point, I don't care...let it whistle.

 

I have a wind noise in my NAS '97 SW around the bulkhead on the passenger side specifically. It's been driving me nuts for years. Same kinda symptoms. I'm actually thinking it's a seal between the bulkhead and the heater core...am I way off the mark here guys?

 

Have someone else drive the truck as you crawl around like a monkey and try and pinpoint the area it seems to be coming from.