More to come!

Thanks. The job is not hard at all. Just takes time to take everything apart and put it back together, etc. Make sure you buy a quality replacement part so you dont have to do the job twice or deal with a loud fan. Good luck!

Fortunately it was not the clutch fan that disintegrated that can tear up the hoses and damage the metal of the hood First time I have ever heard of a aux fan failing catastrophically and I have had m54 since 2003

Glad it was helpful!

Thanks, the headlights can use a polish for sure.

Wow. If you have the variable speed fan like mine it is controlled by the ECM, with input from several sensors like Radiator outlet temp, A/C pressure, speed, etc. My understandig is the fan receives the signal from the ECM and uses its own power output stage (part of the fan motor) to turn the fan on/off and increase/decrease speed. I would check for codes if you have BMW scanner. Replacing parts until you find the problem is never fun. There are good troubleshooting threads on this topic online.

@@NoGaragE30 can you tell me where to buy that fan, I have bought 3 by eBay/Amazon and non work. It looks like they Dont have module.

@@GuniMatamoros I ordered a Behr OE replacement from FCPEuro here: www.fcpeuro.com/products/bmw-a-c-condenser-fan-motor-525i-528i-530i-540i-m5-351040111

Aux fan should turn on either with the AC or when engine temp reaches a certain level to help the mechanical fan, like when the car is not moving during a hot day.

@@NoGaragE30 also with my 2001 bmw 530i i can also operate aux fan from the computer but its not working no more so i was thinking my aux fan must be broken but ive been driving for a few days no problems thanks bruh

Depending on the conditions where you drive, the engine may not need the additional help from the aux fan. If you live in a cold place or dont drive in heavy traffic for example. There is a chance the AC could need it though and not having it could put addition stress on the compressor.

@@NoGaragE30 ah ok i kind of messed with the AC an now its not working an then i found the aux fan wasnt working either i think it mite be the wiring i dont know its the not the fuses i dont think im ttyna diy fix it

On some vehicles the six fan will mot come on if the ac compressor isn’t engaged. This can happen when you are low on refrigerant. Simplest way to start is apply 12v directly to the fan and see if it spins.

If you have a good fan and 12v at the connector the issue would have to be with the sensors/signals that needed to start the fan. Depending on the fan type you have different things to look at. An early model 4-wire fan is a bit simpler it is usually a temp sensor (which you have replaced) or the fan relay (think this is close to the fuse under glove box). The late model 3-wire fan (like mine) is more complex as it requires signals from the ECM to operate. The easiest test would be to run the A/C on high as this should send a signal quickly. Otherwise you would need a scanner or computer than can run aux fan tests to simulate the signals etc. While working on mine I did see some people online reporting the issue as bad wires to the fan connector, with physically bad wires that would read 12v but not be able to carry the current needed to power the fan, something to keep in mind. There are good troubleshooting threads on this topic online.