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General E46 Forum
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Old 09-04-2012, 05:39 AM   #1
Vas87
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Noisy aircon vent

Hey all, another day, another niggling E46 problem...

My aircon is making a metallic noise what seems to be from the central air vent when climate control is set to low to medium speeds, more so when the engine is cold.

Same noise when temperature is set to low or high.
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Old 09-04-2012, 06:06 AM   #2
dmax
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That would be 'chirping' coming from the blower motor.

I've written about my 'solution' before. Dust and gunk seem to build up on the fan cages and since they're so finely balanced, either causes them to start hitting inside the housing, or maybe it's that this extra, uneven weight causes them to make the bearings chirp.

What I've done and which has helped:

Remove cabin air filter housing, open all the windows, turn the fan to high, and then, take a wet/dry vac and blow from the hood side...to dislodge/blow off this dust/gunk (compressed air would work, but be careful, I think, about getting too close.

If you were industrious, you could remove the panel that the cabin air filter screws into and get direct access to the blower fan...I didn't do this when I was there, but I suppose you could spray the fan down with lysol or something and not only kill the mold, but clean the blades too...though I'd worry about removing grease or lubricant from the bearings (if that's possible...IDK). Suppose if the fan is accessed, you could take a little paint brush and brush the blades off gently, and then blow them off. (Hmmm? I like this idea...think I'll do that next time!)

Anyway, chirping is pretty common here. I did this probably 2 years ago and so far, very few chirping incidents to report! Also, periodically, I'll turn the fan on full high...again with the theory that it will kick dust off. So like many issues 'BMW' sometimes the best thing to do is 'work it'!

HTH...let me know!
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Old 09-04-2012, 06:14 AM   #3
Vas87
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Thanks dmax, I'll try this on the weekend and post back results!
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Old 09-10-2012, 03:56 AM   #4
Vas87
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Didn't work unfortunately, looks like I have to replace the blower, which does not seem like a fun job at all.
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Old 09-10-2012, 04:38 AM   #5
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I've had chirping for years...maybe 5 or more. Just saying. I've got it to where it's only barely noticeable on rare occasions.

Sorry my trick didn't work for you. Did you remove the panel behind the cabin air filter covering the blower and try brushing the blades with a paint brush? I didn't look when I was there, but you might try hitting the bearings with a lube maybe...after you've brushed it off.

I did blower motor in e36 and it wasn't fun. I think ours is easier, but still...I've heard ours is a pitb too.

...and don't forget to exercise the blower....put it to high on occasion, if you don't usually.

GL!
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