humming after engine is off. - BMW Forum - BimmerWerkz.com
3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

 
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#1 (permalink) Old 01-28-2004, 07:45 PM
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hey, after i turn off my engine i hear a constant humming noise that sounds to be coming from the A/C. Is this something i need to worry about? Can i fix it easily? any suggestions are more than welcome.

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#2 (permalink) Old 01-28-2004, 07:49 PM
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http://www.bmw-forums.com/forum/inde...showtopic=8440

Does the noise go away after a few seconds?
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#3 (permalink) Old 01-28-2004, 07:52 PM
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i dont stay in the car long enough for it to stop. so it takes a few minutes from what i gather

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#4 (permalink) Old 01-28-2004, 11:19 PM
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mine does the same thing, i dunno if its the vent fan still running or something.

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#5 (permalink) Old 01-29-2004, 01:36 AM
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Don't know if it's coincidental, or related...but my noise goes away when the interior lights go off a few seconds after you take out the key. I always thought it was some sort of capisitor or relay noise.

<span style='color:green'>1994 325i </span>- - - 75,000 mi.
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<span style='color:green'>1995 525i </span>- - - 154,000 mi.
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#6 (permalink) Old 01-29-2004, 06:27 AM
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Oh dont u just love beemers and the noises that they make?

In the cold I used to notice the climate control would make a "click-clunk" noise from the console where the transmission selector is. Apparantly its a release valve that gets rid of excess hot air or something.

The noise you're talking about, the gradually decreasing "Hhhhhmmmmmmmmmm" noise is from the climate control system. When you press the buttons on your climate control (Air for top, air for front, air for the footwells) u will hear similar sounds. My guess is that when the engine is turned off, the climate control system shuts down the outside air or closes the vents inside to prevent any air loss etc.

If you've had the air conditioning on as well, u will hear some refrigerant noises as well. Something to do with back pressure when the system is turned off.

There's another noise that comes from the dimming circuit which automatically dims the courtesy interior light. The sound is quite similar to a normal household light switch dimmer.

All these noises will disappear after a minute or so. I think they are funky!! its a unique signature for my car. Freaks everyone out esp at nite time! I love my beemer now! as sad as that sounds!
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