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#2
05-02-2016, 02:51 PM
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I installed the Behr unit on a 528 and works as designed with no issues. Fit & finish was the same as the OE unit.
__________________
 2005 X5 4.8IS The Blue ones are always FASTER.... Current Garage: 2005 X5 4.8is 2002 M5 TiSilver 2003 525iT 1998 528i Former Garage Stable Highlights 2004 325XiT Sport 1973 De Tomaso Pantera, L Model 1970 Dodge Challenger T/A 4 sp Alpine White 1970 Dodge Challenger T/A 4 sp GoManGo Green 1971 Dart Sport, “Dart Light” package 1969 Road Runner 383 1968 Ply Barracuda 340S FB Sea-foam Green 
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#6
05-02-2016, 11:36 PM
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Thanks for the feedback guys, ordered the Behr fan today was the quicker option as well. While we are the fan topic, does anyone know exactly how it is controlled ? Does the control wire send a request signal to electronics in the fan motor to control speed or does the control wire directly turn on and modulate fan speed ? I don't think it's just a transistor in the fan motor like the wiring diagram shows!
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#7
05-03-2016, 04:57 AM
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The transistor symbol in the wiring represents some form of signal processing or a driver circuit - it's common in BMW wiring diagrams to represent complex circuits with a transistor symbol.
The aux. fan is controlled by the DME/DDE via pulse width modulation, on the third (smaller) wire. The fan driver in the hub of the fan (in the later versions - it's in a separate box on the fan frame on earlier models) uses the PWM signal to modulate the fixed +VE input voltage and control the fan speed.
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Wayne 2005 BMW X5 3.0d (b 02/05) 2001 BMW F650GS Dakar (b 06/01) 
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#8
05-03-2016, 07:13 AM
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Quote:
Here's is why the fan is so expensive and why you shouldn't buy the cheapest fan. http://www.xoutpost.com/934347-post3.html
__________________
2006 Infiniti G35 2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD Lotus Europa 1970 Destroyed by fire Lotus Europa 1970 S2 Renault Powered Lotus Type 52 1970 Twincam Webers Powered PORSCHE 911 Targa 1982 The Garage Queen Audi Avant donated to Kars for Kids BMW 525IT Sold Audi 4000CS Quattro Sold Jensen Healey Lotus Powered Sold Opel 1900 Sold Triumph Spitfire 1971 Sold Triumph Spitfire 1968 Sold Plymouth "Cuda" 340 Six pack SOLD
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#9
05-03-2016, 09:36 AM
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That's excellent information guys Thanks! I guess I should have put a scope on the third wire and check for a PWM signal. Thanks for that link to pic as well, I was going to have a look inside but I couldn't get mine apart! That's a lot of electronics for what it does but I'm guessing a lot of it is to run the brushless motor.
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#10
05-04-2016, 04:52 PM
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Quote:
https://www.youtube.com/watch?v=winfXPvjtgQ Eric is one of the better mechanic on youtube, way better than ETCG.
__________________
2006 Infiniti G35 2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD Lotus Europa 1970 Destroyed by fire Lotus Europa 1970 S2 Renault Powered Lotus Type 52 1970 Twincam Webers Powered PORSCHE 911 Targa 1982 The Garage Queen Audi Avant donated to Kars for Kids BMW 525IT Sold Audi 4000CS Quattro Sold Jensen Healey Lotus Powered Sold Opel 1900 Sold Triumph Spitfire 1971 Sold Triumph Spitfire 1968 Sold Plymouth "Cuda" 340 Six pack SOLD
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