Rear Window Turbulence/ Vacuum/ or ?

[thegoodword]

When cruising down the highway at any speed above 55mph, I get a weird, loud vibrating sound coming from the rear passenger windows being rolled down all the way. Having the front drivers/passenger windows up or down does not change the loud sound. The rig still drives just fine, it is just loud - abnormally loud. I am unable to articulate the issue any better than some sort of turbulence or vacuum. I searched this forum and did not find anything, so if I missed a good thread on this issue, please feel free to point me towards it. I never had this issue in my FJ62 or 80 series, so maybe this is just the way it is with the 100?

 

[crimsonaudio]

It's some sort of aerodynamic issue, mine does the same. I've had several different vehicles over the years that did this as well...

 

[OregonLC]

Open the wing windows and it goes away.

 

[TXLX100]

It's called wind throb (that's what I call it). Technical term is Helmholtz resonance. Pressure is having a hard time equalizing with a limited opening to a large area. I usually crack the very rear windows when operating sunroof or only rear passenger windows are down.

 

[TheForger]

Happens to me all the time when my dog is in the backseat and I have one of those windows down. It's almost a buffering noise that really bothers my ears. I also open the rear vents and it goes away or sometimes I can crack the driver or passenger windows and it will equalize.

 

[Muddy Bean]

Yep. Totally normal. I read somewhere that the more aerodynamic a vehicle is, the more pronounced this turbulence is. As someone said, open the rear vents. Problem solved.

 

[ogsuv]

I've heard it called buffeting. The air gets trapped in back. The corvette guys deal with this. They sell a piece that props the trunk open a tiny bit for them.

 

[tabraha]

Always called it buffeting as well. Now I get to use Helmholtz resonance next time.

Rear quarter glass open is your friend. Just like cracking the back glass on a 4R or Sequoia.

 

[Scottb4857]

Yep - normal on this truck. On my 3 series when the kids roll down one of the back windows at any speed above 35 or so it creates so much pressure it physically hurts my ears, but all I have to do is crack one of the front or the sunroof and goes away. Just needs somewhere for the air to vent.