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Message: <blockquote data-quote="wutty" data-source="post: 562159" data-attributes="member: 23492">Based on my limited knowledge (pls correct me if i am wrong) :1. If temp gauge is at centre than it is at normal operating temp ~ 80C.2. For M52, the aux fan normally run at low speed when you turn on the AC (triggered by AC control unit). You may need to stand in front of the car and get someone else to switch the AC on/off to see if the fan is activated or not as it may not be obvious when the fan is running at low speed.3. It only switches to high speed (very noisy) when the engine temp (controlled by a switch attached to right hand side of the radiator.) or the AC pressure (triggered by AC control unit) gets too high.  My aux fan used to frequently run at high speed whenever my car is stationary. After replacing my fan clutch, I seldom hear it anymore. So if you aux fan is not noisy, it is actually a good thing.</blockquote>