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Message: <blockquote data-quote="t2ribena" data-source="post: 339922" data-attributes="member: 3847">there is no fan clucth on the N52's e60...its using electric motor...so got fan switch nia...<img src="http://www.bmwclubmalaysia.com/forums/images/icons/icon10.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> already check and working fine...  electric motor does not fail suddenly but it losses its performance and efficiency first...in the case of my high speed overheating, the pump could not keep up with the coolant movement requirment to achieved the required cooling during high speed driving...in slow driving or stuck in the jam, the pump does not need to be pumping at maximum level so the reduced performance of the pump could handle the requirement...but over time with this pump that is deteriorating, eventually the engine would overheat even driving at low speed...</blockquote>