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My blower is going on its own

Tiny
ADRIAN2212
  • MEMBER
  • 2002 BMW 530I
  • 101,000 MILES
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
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Sunday, April 8th, 2012 AT 11:41 AM

2 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
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
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Sunday, April 8th, 2012 AT 2:15 PM
Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
It is the final stage, no need to guess or have it scanned. Just replace it.
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Sunday, April 8th, 2012 AT 3:51 PM

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