Bcredliner posted an interesting observation in his electric fan conversion thread.

He said you cant control engine operating temp via fan, the thermostat does that.

True the fan can only control operating temp if the water flow is open all the time.

It makes sense indeed and it seems to be whats happening in my case.

Cant think of anything else it could be at the moment.

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04 X5 3.0i auto
03 X5 4.6is