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Old 04-12-2018, 03:13 PM
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Electric radiator fan from 2005

Does anyone know if the stock electric radiator fan (not the aux fan) can be swapped into an '03 X5? It would replace the clutch fan in this scenario, on a 3.0i. Did the 2005's have an aux fan also or just the one electric fan?
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Old 04-12-2018, 04:54 PM
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Quote:
Originally Posted by Morrison View Post
Does anyone know if the stock electric radiator fan (not the aux fan) can be swapped into an '03 X5? It would replace the clutch fan in this scenario, on a 3.0i. Did the 2005's have an aux fan also or just the one electric fan?
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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Old 04-12-2018, 05:18 PM
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Quote:
Originally Posted by Morrison View Post
Does anyone know if the stock electric radiator fan (not the aux fan) can be swapped into an '03 X5? It would replace the clutch fan in this scenario, on a 3.0i. Did the 2005's have an aux fan also or just the one electric fan?
It's not a year thing - I think only the N62 (either N62B44 or N62B48) engine E53 came with an electric fan behind the radiator. The rest are all viscous clutch types operated by the main crankshaft pulley and belt, like in my 2005 M57N 3.0d.

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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Old 04-12-2018, 07:55 PM
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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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Old 04-13-2018, 01:54 PM
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Originally Posted by 80stech View Post
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.
Yeah, that's what I'm after. In the E46 world its common for people with automatics to delete the clutch fan and the front pusher fan - then add in just the one electric radiator fan from a manual transmission car.

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.
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Old 04-13-2018, 03:40 PM
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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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Old 04-13-2018, 05:53 PM
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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.

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Old 04-15-2018, 02:00 PM
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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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Old 04-16-2018, 09:01 AM
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