my blower is going on its own

2002 BMW 530I
101,000 MILES
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ADRIAN2212
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Hi,
I own a BMW 530 2002, it has a fault where the blower keeps fluctuating on its own when in operation and as now started turning itself on even when the ignition is off. I pulled the fuse which controls all of the heating/blower controls but a fan inside the dashboard area can be heard running intermittetly thus flattening the battery overnight.

Can anybody help please ? Is this a known fault
Many Thanks in anticipation
Apr 8, 2012 at 11:41 AM
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ASEMASTER6371
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there is a final stage unit that is the controller for the blower contained in the hvac controller.

you need help from a shop with a scan tool to monitor what is happenings.

a very expensive guess if it is not the issue but all powers and grounds need to be verified first before looking at controllers.

Roy
Apr 8, 2012 at 2:15 PM
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DOCHAGERTY
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It is the final stage, no need to guess or have it scanned. Just replace it.
Apr 8, 2012 at 3:51 PM
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