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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 for 1997 and 1998).

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:

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):

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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