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  #61  
Old 05-27-2009, 01:57 PM
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I mean, people, ... If you not sure how aux fan works in X5, don't give advices. There is no way to power up fan "from battery"

Connector that goes to fan has 3 wires. One CONSTANT power, another constant ground (both thick wires)
3rd is a signal wire. Depending on width of signal control built into fan will apply power. If you have oscilloscope you can watch that signal wire to make sure computer sends proper signal.

Fuse protects only (+) wire but most likely it is fine.

On start-up DME will start fan for short period of time and then watch if there is current coming back (motor spinning working as alternator). Thats how DME knows if fan motor is good.

I beleive AC will work even with aux bad. There is evidences here that "AC works only while moving". I make this conclusions from reading forums but I'm not sure how DME control things internally...
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  #62  
Old 05-27-2009, 06:26 PM
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Quote:
Originally Posted by switchman View Post
In a rush to get a/c working again due to hi 80's weather around here, so i bought fsu from dealer today. After work, started car and blower was working cold air and i'm looking at new fsu,,, what to do with it ? Is it possibel fsu may fail again ?
I have replaced the fsu and noticed that the a/c "auto" now really works. When car is hot on startup, blower goes into maximum and eventually slows down speed as car cools.
Thanks to members of this board, i have fixed a prblem.
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  #63  
Old 04-21-2010, 08:57 AM
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Read entire thread, great stuff.

I'm trying to figure out why my Aux fan won't engage when parked but my A/C blows cold air. I have codes for AUX Fan showing, could someone please adivse.

thanks
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  #64  
Old 04-28-2010, 06:53 PM
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I was just diagnosed with this problem and the dealer wants 1k to replace my aux fan. It was determined bad after they installed a new aux fan from outside the car? I read all the attached threads on this subject and saw that to replace the aux fan the front bumpber needs to be removed to de/re-install? Does anyone have a write up that I could follow and do myself? It seems it'd be four screws and plug, not to over simplify our complicated vehicles.

Thanks for the input.

David
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  #65  
Old 04-28-2010, 07:26 PM
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I've always wondered why car manufacturers/suppliers seemingly cannot design a blower motor resistor (Final Stage Resistor in BMW-speak) that is more reliable. Blower motor resistor failure seems to be a rather common failure mode on many vehicles, e.g., I replaced one on my 1982 Toyota, someone else' s Ford Focus, a friend's Ford Taurus, etc.
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  #66  
Old 06-19-2010, 02:11 AM
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Hey, well i just replaced my aux fan....it all started when i noticed that i was driving with my max button for the most part of the trip so i though well i have 130K maybe i need to charge the system. Since its cheaper to charge the system then replace fan i did that and i noticed it blew cold so a month later i noticed that driver side is coldest and when comming to a stop the ac blows hot air. so went to an indy and he check and fan didnt turn on even when the truck was fully warmed up and it was 95F outside. So bought new oem fan from ebay for 335 shipped. its quite simple to replace. I followed the direction on here to remove the plastic bumper and the metal bumper i didnt fully remove i just loosened all the bolts and that gave enough room to slide the whole fan assembly down and out and the new one was replace same way. this all took me about 2hrs at most. now my problem is that it now blows cold but i noticed that the driver side is still the coldest. so the compressor has to be working for it to blow cold, and its not the FSR since im getting air. Im down to either low charge (even tho it was charged at most 1.5months ago by dumping creating vacuum not the cheap way of just adding) or the water valves are stuck? any suggestions. Should i charge once more? it cost me 80 bucks from the looks of the price for the valves i think its still cheaper what do you guys think?

this thread is on the valve issue

http://www.xoutpost.com/bmw-sav-foru...ht-thread.html

and this one has some tricks which i will try tomorrow

http://www.xoutpost.com/bmw-sav-foru...nger-side.html

also is there a way to merge these threads since their really great tool for diagnostic purposes for a very common issue?

Last edited by ArtMan; 06-19-2010 at 02:18 AM.
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  #67  
Old 06-19-2010, 01:12 PM
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If you go get the AC charge checked again go somewhere with an AC machine that automatically fills to the right amount as the X5 only takes 0.98 lbs of refrigerant.

And it is possible that the aux fan being out caused you to lose a small bit of charge as the high side pressure can spike upwards of 400psi with the fan out causing it to purge a bit from the blow out valve on the compressor...
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  #68  
Old 06-20-2010, 02:09 AM
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hmm.....makes sense...today i checked the temps from left to right (driver to pass) it was 60, 62ish, 68ish, 72ish. so its not just me the there is a real difference i guess..ill get the freon checked out again and see how things are..
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  #69  
Old 06-20-2010, 02:31 AM
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i suspect the aux fan is not so crucial for ac since the engine fan is more powerful and it does suck a good amount of air thru the radiator fins. i have seen someone who removed their aux fan on his e53. the ac is a lot more sensitive to the feon level.
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  #70  
Old 06-20-2010, 03:42 AM
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Rockmelon....i think you forgot to read my post....it BLOWS HOT WITHOUT the fan..!!!!! with fan blows cold without blows hot. its simple ...also the engine fan is not that powerful! it doesn't suck that much air the aux fan is a pusher fan it pushes air into the radiator! Im not sure who would in the right mind remove the fan but none the less i don't see how it works without the fan when mine didn't and a dozen other users here had similar problems.
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