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#1 (permalink) Old 03-23-2006, 07:33 PM
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Humming after shutoff

I noticed for the 1st time today, (not to say its never happened before) that after a 20 min drive in my 01' 330i, a humming sound coming from the car after engine shutoff. it seemed to last about 3-4 minutes and was apparently coming from under the engine cover. The sound can only be described as a electrical hum like from florsent lights. the cooling fans wern't on. Is this normal?
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#2 (permalink) Old 03-23-2006, 08:52 PM
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Asbolteuly. It's your Air conditioning unit discharging or some gibberish.


If that's what you're describing. Can you hear it from the cockpit? Does it sound liek it's comign through the vents?


1995 BMW M3 Turbo - Dakar/Black
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#3 (permalink) Old 03-24-2006, 10:51 AM
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My car's been doing this climate control after-shut-off venting since I bought the car in December. It sounds like the electrical AC fan too. Not worried about it.

A funny thing though, while were on this subject. Has anyone noticed their AC/climate control "surge" in speed/intensity while the AC/climate control is on? I have noticed this sometimes. The fan seems to burst or surge to higher revs for fractions of a second at a time and then slow back down again.

This is not always, just sometimes. Any ideas? No big deal, but I was just curious. Kind of sounds like the AC is having an epileptic seizure.

Ari Cohen
2002 BMW 325i
5spd manual
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#4 (permalink) Old 03-24-2006, 12:56 PM
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the surging is most likely a bad final stage resistor. Im sure if you do a search on this subject it will yield plenty of results.

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#5 (permalink) Old 03-27-2006, 05:17 PM
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run the heat high for a minute or two, even if its 90 derees outside, remove some of the heat of out the cover...try it
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