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#1
03-26-2015, 02:17 PM
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Possible Aux Fan Switch Failure?
Hey there everyone! Got a quick question..I have an 03 X5 and for the past week, when I start the car, the aux fan runs at full throttle for about 30 seconds, then it just winds back down to normal speed. It only does this when the engine is cold. I make sure I don't crank it with the A/C on, but when I do turn it on, it works fine. Any tips? I was thinking it could be the auxiliary fan switch, since the fan itself seems to be spinning properly.
Whatcha think!? 
__________________
Just surfing life's waves one breaker at a time. 2003 X5 3.0i Blue Exterior Black Interior 
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#3
03-26-2015, 06:41 PM
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Really?? It just started doing it and I've had the car a good while. It definitely doesn't seem normal. People probably think my car is about to explode!
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Just surfing life's waves one breaker at a time. 2003 X5 3.0i Blue Exterior Black Interior
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#4
03-26-2015, 06:49 PM
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Yes it's normal. It is a self check done only on cold starts. I never noticed it too till my fan died and I started research on diagnosing the system lol!
Upon research, some ways to check fan function is that the fan should go high speed when MAX AC is engaged, and go high speed for a few seconds on cold start up. There are no switches in the system, the fan is controlled directly by the DME via a signal wire.
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04 X5 3.0i auto 03 X5 4.6is
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#5
03-26-2015, 06:51 PM
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I guess I don't understand why it just started out of the blue.
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Just surfing life's waves one breaker at a time. 2003 X5 3.0i Blue Exterior Black Interior
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#7
03-26-2015, 07:58 PM
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I need to get a video...I think this is louder and different than you think. This is incredibly loud. Not like it just getting "warmed up" or anything. I will try to get a video tomorrow morning.
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Just surfing life's waves one breaker at a time. 2003 X5 3.0i Blue Exterior Black Interior
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#8
03-26-2015, 08:36 PM
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Yes a video would probably show if anything is amiss.
Try to compare fan speed at cold start and fan speed when you turn on MAX AC. They should be the same. At both instances fan is at maximum speed.
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04 X5 3.0i auto 03 X5 4.6is
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#9
03-26-2015, 09:43 PM
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If you have a fan switch failure be prepared to shell out some BIG BUCKS. The fan is controlled by the DME.
__________________
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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#10
03-27-2015, 07:34 AM
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Grabbed a video this morning so y'all could hear it. https://youtu.be/u10F4lYYRSA
__________________
Just surfing life's waves one breaker at a time. 2003 X5 3.0i Blue Exterior Black Interior
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