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Old 11-16-2007, 06:23 PM
cn90 cn90 is offline
Officially Welcomed to the 'Fest
Location: Omaha NE
 
Join Date: Mar 2006
Posts: 14,816
Mein Auto: 1998 528i 5-sp 140K+
solid snake,
How are you doing in Glasgow? Is it cold like US now?

The only time you need the Auxiliary Fan (aka Push Fan) is when:
- AC is ON
- Hot ambient temp (like 90-100 deg F)
- Car not moving (as soon as car moves around 15-20 mph, there is no need for Aux Fan).

I think you luck out because 97 (and I think 98) models use a Siemens motor that you can buy in the US for $80 or so at Autozone. This write-up is for 1997 but I am almost sure it is the same for 98.
(check for Part Number at www.realoem.com for 1997 and 1998).

http://forums.bimmerforums.com/forum...d.php?t=605750

It kind of makes sense because if the fan motor is dead why replace the whole fan assembly (US $400)??? Just replace the motor right (US $80)?

But the control of the Aux Fan is by the "brain", the circuit is in my post #37 in this link:
https://www.bimmerfest.com/forums/sho...circuit&page=2

So once you remove the fan; apply 12V to it, if it does not run then it is R.I.P.! Then buy a Siemens motor somewhere in Scottland.

Procedure to remove the Aux Fan is here (bumper needs to come off first):
http://bimmerboard.com/forums/posts/356191

Your last resort, if you cannot find the Siemens fan in Scottland, is to have a local shop rebuild your fan. Very often when an electrical motor fails, it is either bearing or the worn bushing issues. The winding should be good still. A good electrical shop can easily rebuild it for you.

Hope this helps.

Last edited by cn90; 11-16-2007 at 06:29 PM.
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