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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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Old 06-09-2011, 02:47 PM
mrpumpk1n mrpumpk1n is offline
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Location: new york city
Join Date: Apr 2009
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Mein Auto: 540i 1997
Interesting Thing After FSU Replacement

So today i replaced the FSU on my 97 540iA. Until now, with the AC on, with the blower setting all the way at max, there would be a decent amount of cold air in the cabin. (i never had the ac working at full capacity up until now as im finding out today, and i didnt even realize). So up until now, the aux fan wouldnt always come on while the AC was on, it would only come on for a few mins spinning very fast and then shut off, and so on. After changing the FSU today, the aux fan is on almost all the time (i say almost, because the rest of the time im driving and cant really tell) while the AC is on, and the amount of air into the cabin is at least double what i used to get before. Needless to say, the blower no longer has a mind of its own. Is this just a coincidence or does the FSU somehow also control the aux fan along with the temp switch and other items? Just wanted to share what i found today.

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