crackling noise at base of windshield

[dynoray]

on my 2015 Hd gasser i hear this crackling sound at highway speeds ,sounds like its coming from the base of the windshield.  thought it was the cowl plastic covers,  i took out the plastic pin clips and put screws in to tighten that up.  noise still there.   Anybody had this?    thanks

[newdude]

On 9/22/2025 at 10:29 AM, dynoray said:

on my 2015 Hd gasser i hear this crackling sound at highway speeds ,sounds like its coming from the base of the windshield.  thought it was the cowl plastic covers,  i took out the plastic pin clips and put screws in to tighten that up.  noise still there.   Anybody had this?    thanks

 

 

Do you have a hood deflector installed?  

[dynoray]

yes, i took it off and its still there, it really sounds like right at base of windshield

[newdude]

1 hour ago, dynoray said:

yes, i took it off and its still there, it really sounds like right at base of windshield

 

 

That's why I asked about the hood deflector as that was a problem on the 07-14 trucks.  It would direct too much air at the windshield and cause a noise.

 

The only other thing I see is this TSB - MC-10143425-9999.pdf

[dynoray]

ok,thanks.   those earlier trucks are different at that cowl area.    ive had it since new with the deflector,it didnt start doing this until like a few years ago.   ill keep checking.    Its not a whistle, Its a weird crack or crackling sound.    very strange

Edited September 25, 2025 by dynoray

[Z45]

Loose trim, air gets under at speed and can be hard to determine when parked.  Had a problem similar on my 2009 Cadillac CTS4. Terrible noise at speed but everything seemed ok when stopped.  Shop was dumb founded so they had the body shop check and they found part of the glass trim would let air underneath and that made noise. How they found out, put masking tape over parts till noise when away. When the tried to replace the trim piece, they broke the glass. 

Edited October 1, 2025 by Z45

[dynoray]

ok,its fixed!!    i replaced the cowl grille plastic assembly at the base of the windshield.    i also added some cloth tape to the area where it clips to the base of the cowl and the u shaped clips that go to the bottom of the windshield.   all good, this truck has no other mouldings anywhere but the cowl piece.