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#1
05-05-2008, 10:52 PM
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Final Stage Resistor or Aux Fan?
Hey guys,
I can't figure out which one is faulty: A/C not working and aux fan not coming on when A/C is on. A/C compressor DOES engage. I checked voltage on harness going to fan, and I get 14V on one wire, 3.5V on other wire, and a ground. Voltages are the same with or without A/C on. I can't get the fan to turn on hooking it straight to 12 volts. Any ideas? Maybe fan relay? Last edited by Pipes; 05-05-2008 at 10:59 PM. 
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#3
05-08-2008, 09:18 PM
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your FSR went. it would stop everything. part is $80, DIY.
__________________
2002 X5 3.0 Siena Red Premium, Cold Weather, Rear Climate Packages, 19" Wheels Aluminum Running Boards, Clear Tail Lights, Clear Side Markers Titanium Kidney Grills, Titanium Trunk Lid, Xenon Headlights 4.6is X5 exhausts, 35% Tint, Aluminum Pedals 2005 530I Mystic Blue Premium Package, Sport Package, Xenon Headlights 18" Sport Wheels, 35% Tint all around Mods to come: M-Tech Front Bumper, M5 Side Skirts, M5 Rear Bumper Quad Exhausts, Style 172 19" Wheels
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#4
05-08-2008, 10:01 PM
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Yeah that's what I thought due to other posts and the readings on the fan plug. But shouldn't I be able to get the fan spinning? Unless I need a new fan too...
I think there is a way of testing the fan, but I can't find any info on that.
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#5
05-08-2008, 10:55 PM
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Quote:
 That's a good starting place. The FSR will make your A/C and blower fan do weird things. Start there, and let us know how things go! 
__________________
2022 X6///M - Toronto Red, Silverstone Full Merino Leather, Executive Package w/Remote Engine Start, Soft-close doors, Heated & Cooled Cupholders, Front Ventilated Seats, Front & Rear Heated Seats, Front Massaging Seats, Carbon Fiber Trim. 2002 X5 3.0i, Sport Premium, Titanium Silver, Grey Dakota, Cold Weather Pkg, Xenons, DICE, LED Tails, just a winter vehicle... 2007 550i, Sport Premium, Silver Grey Metallic, Grey Dakota, Nav, Cold Weather Pkg, Comfort Access, HD Radio, Xenons.
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#8
05-09-2008, 06:17 AM
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Hooking up 12V to these fans directly does not seem to get them to run. My new one wouldn't run with 12V hooked up directly, but ran fine once installed. I don't know if it requires a gate signal to turn on or what. I did find that if I pulled the plug off the pressure switch on the A/C line the fan ran at the highest speed. You might want to test it that way.
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#9
05-09-2008, 12:11 PM
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I just had mine done as well. I had no cold air coming out so when I made an appointment, I told them its the FSR since I'm under warranty but when I showed up at the dealer the SA told me it can't be the FSR if air is blowing. It has to be something else...sure enough, after I picked up the car...the receipt says Auxiliary Fan replaced.
__________________
'04 BMW X5 3.0i TitanSilber Metallic '03 Lexus GX470 Black Onyx --------------------------------------------- '03 BMW X5 3.0i Black Sapphire SOLD 
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#10
05-09-2008, 01:54 PM
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Get the FSR at autohausaz.com they are the cheapest. If you need it sooner, it will be about 30 bucks more at the dealer. There is a writeup on the homepage. It is pretty easy to do, just a small space.
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Eazy wit da Haaahdwaire!!!!
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