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Old 04-15-2019, 05:18 PM   #1
Joedigity
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whistling sound from window at highway speed

I've got a 2001 330ci that I have replaced just about every single gasket, seal, and rubber part on since I bought it. I replaced the weather stripping on both drivers and passengers doors shortly after I bought the car and it is still whistling like crazy when the windows are completely closed at highway speeds. Does anyone here have any solutions to create a better seal when the window is completely closed? The whistling sound is starting to bug me.
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Old 04-16-2019, 07:42 AM   #2
markusmarkus
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Do the windows go up that last 1/2 when you close the door? Are you sure the noise is coming from the windows?
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Old 04-16-2019, 11:38 AM   #3
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Yes, the windows go up another 1/2" or so when the door is closed. Not sure if the window itself needs to be adjusted or tightened on the track inside the door or what? Yes, it's definitely coming from the window/ seal.
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Old 04-16-2019, 12:33 PM   #4
Bpat1218
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If you can't tell where it's coming from you could try shimming different areas from the inside to see where pressure is needed to get a full seal

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Old 04-16-2019, 12:59 PM   #5
TobyB
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Or use tape to cover things.

Mine had a damaged mirror mount. It didn't really show from the outside,
but when I took it apart, the mounts were bent slightly. A little hammer
and dolly work, a bit of filing of the mirror itself, and it sits back inside
the trim line, and doesn't whistle.

I found it by taping over seams until the noise went away, then
taking the tape off again in the reverse order until it came back.
Yes, it's a pain in the ass to climb over the center console, and yes,
I drove around with tape on the outside of the mirror mount for longer
than I'd care to admit...

hth,

t
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Old 04-16-2019, 01:24 PM   #6
Joedigity
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Ahh, TobyB, I am almost certain that my mirror mount is damaged. I will take it apart and have a look. Thanks for the feedback.

Last edited by Joedigity; 04-16-2019 at 01:30 PM.
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Old 04-16-2019, 01:27 PM   #7
IceWhite
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You can also park your car in the garage, turn on the car to the 1st position (Don't start the car). Turn on the fan on full, step out the car and close the door.

Now while the fan is blowing on the inside of the car and you are outside of the car, you can feel around the window area for flowing air. If it's dead quiet, you might even hear a slight whistle.

Hope this helps!
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Old 04-20-2019, 02:56 PM   #8
Joedigity
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Hey Ice, I tried your suggestion and could not hear any air escaping around the weather stripping. Hmmm
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Old 04-21-2019, 03:40 AM   #9
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Quote:
Originally Posted by Joedigity View Post
I've got a 2001 330ci that I have replaced just about every single gasket, seal, and rubber part on since I bought it. I replaced the weather stripping on both drivers and passengers doors shortly after I bought the car and it is still whistling like crazy when the windows are completely closed at highway speeds. Does anyone here have any solutions to create a better seal when the window is completely closed? The whistling sound is starting to bug me.
I treat all rubber seals with silicone grease (or gummy pfledge) and it creates a much better seal as the rubber becomes softer. Cured a similar issue I had with my Opel Astra.
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Old 04-21-2019, 04:14 AM   #10
RayPooley
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Quote:
Originally Posted by Joedigity View Post
I've got a 2001 330ci that I have replaced just about every single gasket, seal, and rubber part on since I bought it. I replaced the weather stripping on both drivers and passengers doors shortly after I bought the car and it is still whistling like crazy when the windows are completely closed at highway speeds. Does anyone here have any solutions to create a better seal when the window is completely closed? The whistling sound is starting to bug me.
Could it be coming from the gap between the wing mirror and the A pillar? Tape something in that gap and see if it stops it.

EDIT: Just read TobyB's comment. I used to have an E36 and the part of the wing mirror body that faced the gap had small bumps moulded into it. I asked BMW why they were there and I was rold it was to create turbulence and prevent whistling. So I would focus on the wing mirror.

Last edited by RayPooley; 04-21-2019 at 04:20 AM.
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Old 04-21-2019, 05:56 AM   #11
sefeing
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Check the black rain gutter trim - this is what caused it for me. The trim can slide forward & create a bad gap / seal. just push it back towards the rear of the car.
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Old 04-21-2019, 06:10 AM   #12
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Try the dollar bill trick and also use a mechanic stethoscope to narrow in on the noise.

Using a dollar bill, roll it up in the window across the window gasket and attempt to pull out the dollar bill, it should not pull out. You will need to re-position and move the dollar bill along the entire edge of the glass and try the same procedure.

This is the stethoscope you need - https://www.amazon.com/Lisle-52500-M...s%2C319&sr=8-1

You remove the plastic transducer at the end of the stethoscope and then you have an open hose that you can move around and search for the noise while driving, a bit tricky at times, do on a deserted section of road for safety reasons.

But also understand you may be chasing the wrong problem. As mentioned trim and other things can cause whistling noise. Blue painters tape to mask off trim around the windshield and other places is a useful tool. Also rule out the brake booster, HVAC fan, climate control head unit fan and DME fan as possible sources of noise.
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Old 04-21-2019, 07:45 AM   #13
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Not a car window, but same idea, use a dollar bill.

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Temp Info - https://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temp, Fuel Level - https://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose temp switch O-ring - BMW #13621743299
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Old 04-22-2019, 12:19 PM   #14
IceWhite
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Quote:
Originally Posted by Joedigity View Post
Hey Ice, I tried your suggestion and could not hear any air escaping around the weather stripping. Hmmm
Ahh crap. I hoped it would help.

Thanks for your feedback/reply.
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Old 04-22-2019, 12:57 PM   #15
ctlikon
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My coupe whistles through the vertical door window seal where the drivers door window rests against the rear quarter window. There is an adjustment inside the door mechanism that tilts the window in and out and also front to back. I haven't fixed it yet but it was evident when I compared the closed position of the window to the passenger side same area. It is right next to the drivers shoulder and ear while you are driving.
Mine leaks at the bottom red arrow area in the pic.
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Old 04-22-2019, 04:05 PM   #16
Alex323Ci
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coupe windows can get out of adjustment over the 10 plus years since there's no frame. i have adjusted my driver's glass and it made a huge difference. there's a DIY out on this.

also as mentoned the coupe (non-M) mirrors have air foils built into them. if your mirror is damaged it might also be the cause of whistle.
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