Hey all, first tech post here. I just got a 99 mazda b2500 over the weekend, nice little truck in pretty decent shape. Thing is, every time the truck goes over 40 the passenger side vents start making this whistle. By 55 or so, its LOUD. I was fiddling with the air controls, no setting/temp/fan speed seems to make a difference. I did notice that if I opened my window it would go away. The old owner told me about this problem, i figured it wouldn't be a big deal to fix, but it is really annoying and was wondering who's run into this before? I was thinking it could be something jammed in the air vent, or a leak in the air vent, or some weatherstripping-related issue somewhere. Any ideas on where to start are appreciated.

 

bump

 

Found it. Previous owner had the windshield replaced and they did a crappy job sealing it. Now to track down the glass shop that did it...

 

So it’s the Windshield that is whistling ?

sometimes leaves get in the vent system and can either rattle of whistle.

 

Wirelessly posted

Have u tried removing the blower fine abd cleaning it out.

 

yep, had the windshield repaired, the guy said the adhesive primer had failed in that corner and let go. As of Monday, no more whistling!