2001 BMW 320 Electric leak

2001 BMW 320
80,000 MILES • 4 CYL • 2WD • AUTOMATIC
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ANDOORA
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The battery on the car dies over night for no known reason what so ever. I have noticed that it dies faster on colder nights. I have recently changed the battery to a brand new one and checked alternator and starter and they all seem to be working fine. I just dont know what is draining the battery.
did anyone have a similar problem or know anything about this problem
thank you
Oct 27, 2009 at 7:34 PM
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DOCHAGERTY
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The fan motor final stage is suspect.
Oct 28, 2009 at 9:08 AM
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ANDOORA
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sorry, did you mean the fan for the heating and ventaliation system or the radiator fan. I suspect that also because sometimes when the car is off, the fan turns on by itself for few seconds.
Thank you
Oct 28, 2009 at 12:02 PM
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DOCHAGERTY
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I believe the fan motor(the HVAC fan) final stage is the one that is suspect, they fail quite often and can cause the issues you report. Go to Realoem.com for an exploded view, look in the 64 section.
Oct 29, 2009 at 9:06 AM