2001 BMW 525 fan stays on under dash

QWERTY786

MEMBER
2001 BMW 525
6 CYL
2WD
MANUAL
16,000 MILES

Bmw 525d se 2001

Basically my car has a fan which stays on under the dash it seems lyk anytime I touch any electrical item eg remote central locking, window switc, even volume on my steering for the radio it triggers it I was told it could possibly be the f.S.U unit which I have changed 2years ago also a brand new Bosch battery. Well I have changed this again and it has not helped. Could some1 please help because now it seems like it's getting louder don't want anything going too wrong.

ive chnaged the fsu and today I cleaned out the havc sampling fan made no difference so I took my mates climate control unit out, he has the same car as me and his climate control unit does the same thing in my car but in his its okay plaese help thanx

5 Replies

DOCHAGERTY

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9,601 POSTS

Do you mean the blower fan?

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Tuesday, April 6th, 2010 AT 6:20 PM

QWERTY786

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3 POSTS

If you mean blower fan heating fan it ain't that I can hear it outside the car and now it is very load when I open the doors with cental locking it turns on and then it'll go off in a few minutes firstly I couldn't hear it whilst I was drivivg now it's so load I can hear it when it comes on whilst I'm driving any electrical touched it comes on it sounds like the same fan when I had the fsu problem but I have changed this Unit again and it deffenantly ain't that. Thanx

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Wednesday, April 7th, 2010 AT 8:07 AM

DOCHAGERTY

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Where do you say this fan is? Is it inside the car or in the front? Are you sure it's a fan?

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Wednesday, April 7th, 2010 AT 11:40 PM

QWERTY786

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Well it's a Uk spec car right hand drive on the left under the dash on the left hand side you can also hear it very load now outside the car near the left wing can't say if it's a motor or a fan but it only comes on when any electrics are used

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Thursday, April 8th, 2010 AT 2:44 PM

DOCHAGERTY

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9,601 POSTS

The issue seems likely to be something of a mystery unless we can agree on what and where this noise maker is. Inside the dash of the E-39 series vehicles is the blower fan and some electronic actuators, if they are eliminated then what is left is the source of your noise. If it helps, go to Realoem. Com and enter your cars' VIN and see the exploded view for yourself, let me know what you come up with.