Engagement is distinguishable by a definite increase in fan flow noise roaring.
E46 m3 fan clutch noise.
Within ten minutes the air temperature should be up to 88 c 190 f.
It turns out the fan clutch had failed.
Spin the fan to unscrew a little faster but make sure you don t let the fan drop.
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I long suspected that my ac compressor was on its way out.
E46 m3 loud fan noise duration.
How to diagnose bmw bad fan clutch e34 e36 e38 e39 e46 e53 duration.
Fan speed will increase.
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Fan clutch engagement should have started to occur between 88 to 90 c 190 to 194 f.
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It normally squeals a bit when its on and idling at a light.
Max recorded noise 92 1db.
Lock in the water pump pulley and unscrew using the 32mm wrench.
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Use an infrared temperature gun to measure fan clutch temperature.
The fan clutch nut is reverse threaded.