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Old 06-14-2019, 10:17 AM
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Bimmer360 Bimmer360 is offline
Join Date: Nov 2006
Location: Denver, CO
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Originally Posted by Bmwfvr View Post
Hello all. lately, when I start my x5 in the morning (from cold) I notice that the fan runs at a very high speed and is very loud. it stays like this for a while. This is with AC turned off. any idea what it could be? my understanding is the fan should only kick in when coolant temp is high (thermostat in open position) or if AC is switched on.

Thanks in advance.
Is your radiator and temp sensor original, never been replaced? Mine was original from 2006 prod and recently became ridiculously loud, coolant is almost at max level, regardless if my AC was off or on and it's still loud. Replaced sensors and same issue. Figured I should replace the radiator and I did. That fixed the issue and is quiet now.
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