Quote:
Originally Posted by Sophisticated Redneck
Could be your temp sensor that controls the fan. It's on the passenger side coolant return line down low on radiator, it just snaps in. Usually when these fail, the fan defaults to high speed so it could be going out on ya. Super easy to replace
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+1
i agree.. had the same problem with my E46 M3.. there were no problem with the pump.. sensor was faulty reading faulty numbers.. and it was keeping the fan at max speed all the time..