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#1
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Electric radiator fan from 2005
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#2
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2005 X5 3.0i's have two fans. The clutched fan driven by the water pump and an electric fan in front of the radiator. The electric fan is there for the AC system. It kicks on when the car is moving slowly and not moving enough air across the AC coil. It is not there to cool the radiator. It would probably work to cool the radiator, but you would have to wire it so it was on all the time.
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#3
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Quote:
And it seems that in all cases, if the main fan (behind the radiator) is electric, (ie. LCI 4.4i and 4.8is) then there is no aux. fan in front. *edit* I forgot to add - I'm sure you could make it fit but I'm not sure how you could drive it (electrically) as the DME in a 3.0i is not set up for running this fan.
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Wayne 2005 BMW X5 3.0d (b 02/05) 2001 BMW F650GS Dakar (b 06/01) |
#4
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The E83 X3 uses only 1 electric fan behind the radiator. Is that what you mean by a "stock" fan ? I imagine it is PWM just like the X5 aux fan but the DME takes engine cooling and A/C into account.
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1988 325is (purchased new) sold 2004 X5 3.0 2005 X3 2.5 2008 X5 3.0 (new to me) |
#5
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It would be cool if someone had tried swapping in the fan from an N62 V8 model X5 to see 1) if there was clearance to an I6 water pump, and 2) how well it works. In the E46 conversion they just take the plug that went to the aux fan and plug it right into their new main radiator fan, so I would think it would be the same going to an N62 fan but don't have one here to compare plugs. It would be awesome if I could get in and re-program the DME for different fan activation parameters also. |
#6
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There is tons of room for the fan front and back so that is not a factor. There was a link to a fan supplier a week or so ago, maybe check that. In theory if you could reprogram the DME you could just delete the clutch fan and use the front electric. Not easy to do though. You might be better off putting an Arduino or similar micro controller reading engine temp in line with the PWM signal from the DME controlling the fan for A/C.
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1988 325is (purchased new) sold 2004 X5 3.0 2005 X3 2.5 2008 X5 3.0 (new to me) |
#7
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Many miles ago, the service tech failed to reattach the mechanical fan after replacing the alternator and I didn't notice it for over a month until I smelled anti-freeze one evening. I took it back to the dealer and my service writer unloaded on the tech like a freight train. A week after the mechanical fan was remounted, the expansion tank blew (that's probably where my telltale odor was from) and the dealer picked up the tab on that. Then as we entered springtime temps a few weeks later, I realized I had no A/C at idle. The dealer determined the aux fan had burned up too - probably because it was handling the engine cooling load as well as the A/C. So, I wouldn't chance using just the standard aux fan as the sole cooling source. The single fan from the N62 engine is probably a more severe duty unit.
2002 X5 3.0 340,700 miles 2014 428i 36,900 miles 2004 325i Sold at 123,600 miles 2001 325i Sold at 66,000 miles 1970 Firebird Under Restoration |
#8
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I think the way to go is an aftermarket electric fan with an adjustable temp control. I have been running one for a few years now. Purchased fan that puts on way more CFM than needed even for Texas summers. The front electric fan is still in place. The temp control on the aftermarket fan is set to come on just before the front fan does. I have it wired so it continues to cycle after the engine is off until the radiator temp stays below the temp setting. I did a how to thread---Replaced clutch fan with electric fan.
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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior Dallas |
#9
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