Squealing Behind the Dash

Howdy...newby forum user here.

OK, I've been dealing with this for months...no more!

My truck gets a high pitch squealing from behind the dash when I hit speeds of 75 or more. A gust of wind will also cause this noise. It sounds like when you hold a blade of grass between you palms and blow through it; high pitch and annoying.

I've tried messing with the A/C and heater settings, no luck. Tried taping down the washer fluid cable that is attached to the underside of the hood in case that was getting vibrated, nope. I know it is something to do with wind vibrating something under the hood.

My wife is refusing to ride in my truck on the highway and I have no idea what this noise is or who could find/fix it. Any takers on the cause of this noise?

 

Damn fellas!

That was some fast help! I'll get to checking the windshield seal...better yet, as I know nothing of glass, I'll call my shop and they can do it.

We'll see how this helps!

 

you can tape the outside of the windshield with masking tape then go down the highway.if it stops you found your problem