It normally squeals a bit when its on and idling at a light.
E46 m3 fan clutch noise.
Within ten minutes the air temperature should be up to 88 c 190 f.
Fan speed will increase.
It still provides cold air but i jus.
3 6 remove fan using the e46 m3 water pump locking tool 001170sch01a and a 32mm wrench.
I long suspected that my ac compressor was on its way out.
Nathan s bmw workshop 100 504 views.
Lock in the water pump pulley and unscrew using the 32mm wrench.
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It turns out the fan clutch had failed.
Engagement is distinguishable by a definite increase in fan flow noise roaring.
The fan clutch nut is reverse threaded.
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Max recorded noise 92 1db.
Betooll 32mm fan clutch nut wrench water pump holder removal tool kit for bmw e34 e39 e36 e46 e90.
Fan clutch engagement should have started to occur between 88 to 90 c 190 to 194 f.
Spin the fan to unscrew a little faster but make sure you don t let the fan drop.
Use an infrared temperature gun to measure fan clutch temperature.
Bmw e46 heater blower resistor fsr removal and diagnose 320i 323i 325i 328i 330i m3 duration.