What could be causing the humming/buzzing noise I hear after I shut off my car?

1997 BMW 318I
117,200 MILES
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WILLIAMHHENRY
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the noise comes from the area right below my radio. The noise starts as soon as I turn the engine off and goes on seemingly forever. Im pretty sure whatever is behind the noise is running my battery dead.
Nov 7, 2011 at 7:38 PM
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FIXITMR
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have you tried pulling fuses 1 at a time to see what circuit it's tied to?
Nov 7, 2011 at 8:10 PM
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FIXITMR
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it's likely your climate control fan which is a little computer size fan on the circuit board. it wears out/gets out of balance/clogged with dirt/dust. it's suppose to run for awhile after car shuts off. like up to 15 min.
Nov 7, 2011 at 8:20 PM
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WILLIAMHHENRY
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Thanks. Im taking my car to the shop in a couple days for an oil change. Ill talk to them about the noise and let them know what you thought it might be.
Nov 7, 2011 at 9:04 PM
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RIVERMIKERAT
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Were you able to find a fix for this problem williamhenry?
Dec 5, 2011 at 1:35 AM