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Intense vibrations....

Old Jan 15, 2010 | 10:40 AM
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Default Intense vibrations....

Hey guys...funny thing. For the first time I put down my rear driver's side window on my 99 GS400, and had to put it up immediatley because the cabin of the car began to vibrate and the air began to pulsate violently that I could feel the pressure fluctuations in my ear...but only when this window is down while the others are up...

What the heck can this be? I can't imagine toyota would put out a vehicle where the cabin air pressure pulsates violently if the rear driver's window is open at highway speeds?
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Old Jan 15, 2010 | 10:42 AM
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Mine does it too but only at highway speeds (65+). I was wondering the same.
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Old Jan 15, 2010 | 11:26 AM
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Rotors
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Old Jan 15, 2010 | 11:40 AM
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Mine did it before and after rotor replacement. My rotors are fine.
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Old Jan 15, 2010 | 02:01 PM
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Originally Posted by Rippaflow
Mine does it too but only at highway speeds (65+). I was wondering the same.
my rotors are perfectly fine...but yeah mine is about 65+ on average when it happens...I thought maybe suspension, or perhaps unbalanced tires???
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Old Jan 15, 2010 | 02:05 PM
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get an alignment!!!
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Old Jan 15, 2010 | 03:04 PM
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Its called back pressure.
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Old Jan 15, 2010 | 03:19 PM
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its normal
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Old Jan 15, 2010 | 05:26 PM
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seriously guys? he lowers the WINDOW and we point to brakes and alignment? LOL


it's because of the fact that the rear windows are 'square'....in that, their shape, on top of being slightly recessed in comparison to the b-pillar, doesn't split the air current that comes into the car. Your front window has that leading edge to evenly distribute the air when it hits it. With the rear windows, think of it as like a soda bottle when you're pouring it: when you tilt it to level or slightly past, itll pour smooth because half the opening is allowing air in. When you tilt it straight up and down, it 'glubs' because it essentially has to gasp for air to push the water out.

this is the same thing that's happening with the window, just no water and many many more times per second. my stepdads highlander does the same thing, as do many other vehicles.
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Old Jan 15, 2010 | 11:43 PM
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Originally Posted by jcat_GS3
seriously guys? he lowers the WINDOW and we point to brakes and alignment? LOL


it's because of the fact that the rear windows are 'square'....in that, their shape, on top of being slightly recessed in comparison to the b-pillar, doesn't split the air current that comes into the car. Your front window has that leading edge to evenly distribute the air when it hits it. With the rear windows, think of it as like a soda bottle when you're pouring it: when you tilt it to level or slightly past, itll pour smooth because half the opening is allowing air in. When you tilt it straight up and down, it 'glubs' because it essentially has to gasp for air to push the water out.

this is the same thing that's happening with the window, just no water and many many more times per second. my stepdads highlander does the same thing, as do many other vehicles.
+1.

Your car is fine.
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Old Jan 16, 2010 | 02:53 AM
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Actually i notice a pressure change if your driving 60+ and roll both rear windows down. You can really noticed the pressure in your ears..
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Old Jan 16, 2010 | 08:13 AM
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I love how our sunroofs make that super tight air seal sound when they close on the highway lol
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Old Jan 16, 2010 | 08:24 AM
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Originally Posted by Rippaflow
I love how our sunroofs make that super tight air seal sound when they close on the highway lol
ha ha x's 2
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Old Jan 16, 2010 | 11:58 AM
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^ yup gotta love it
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Old Jan 16, 2010 | 01:27 PM
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Originally Posted by jcat_GS3
seriously guys? he lowers the WINDOW and we point to brakes and alignment? LOL


it's because of the fact that the rear windows are 'square'....in that, their shape, on top of being slightly recessed in comparison to the b-pillar, doesn't split the air current that comes into the car. Your front window has that leading edge to evenly distribute the air when it hits it. With the rear windows, think of it as like a soda bottle when you're pouring it: when you tilt it to level or slightly past, itll pour smooth because half the opening is allowing air in. When you tilt it straight up and down, it 'glubs' because it essentially has to gasp for air to push the water out.

this is the same thing that's happening with the window, just no water and many many more times per second. my stepdads highlander does the same thing, as do many other vehicles.


Awesome explanation bro
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