Bimmerfest - BMW Forums - View Single Post - 2004 X3 3.0 Radiator Fluid & Transmission Leak Questions [Update]
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Old 12-05-2012, 09:50 AM
Supercourse Supercourse is offline
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Location: British Columbia, Canada
Join Date: Feb 2008
Posts: 3,890
Mein Auto: 2004 X3 2.5i
BMW engineers like to avoid accessories that are a drag on engine power, so electric cooling fans area no-brainer.

For the 2007+ model they moved to an electric water pump.

Not sure where they are with electric power steering across the current model range.

Transfer cases are thought to be a weak point with the X3 based on discussion in this forum.

Mostly it's the separate actuator that wears out, but some owners have had bigger problems either as a consequence of that, or lubrication issues.

For part of the 2004 model year X3 transfer cases were filled with A/T fluid as the newly-developed xDrive fluid was not available then.

Dealers did not replace the fluid unless a wear value code was thrown based on monitoring of resistance in clutch plate operation.

Fluid costs about $50 so any cautious owner should have had it done regardless.
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