Check power and ground at the fan connector.
Bmw 335i radiator fan not working.
Cooling fan problem solved bmw e36 318i.
Diy bmw radiator fan stuck on high.
The fan will usually store a fault in the dme for activation or ihka system faulted for excess pressure because fan is not coming on.
If fan is giving you a hard time and will not drop all the way down check to see if bottom of cooling fan is hung up on radiator.
While there are a variety of reasons your bmw 335i is overheating the most common 3 are a coolant leak water pump radiator hose etc the radiator fan or a failed thermostat.
If you experience no air blowing no heat in my situation as i did in my 2012 x5 35i 88 000 miles battery almost 7 yrs old on the coldest day of the s.
The fan has a final stage resistor built in so it gets a pwm signal for activation and speed.
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41 of the time it s coolant leak water pump radiator hose etc.
Bmw e90 radiator fan fuse location and replacement e91 e92 e93 bmw 325i 328i 330i 335i 316d 318d 320d 325d 330d 335d 316i 318i 320i 323i 325xi 328xi 335xi th.
Http go magik ly ml 7uko here i will explain the diag proces.