Hi Fausto, The problem with your vehicle could be the activating relay, the fuse, the fan activating temperature sensor, or a defective fan. As this is unusual for BMW, Keep in mind that the fan will only operate when the engine reaches the required temperature, not all the time. Regards John
SOURCE: leaking coolant from engine..
Unfortunately, This Problem is Going to Be Either a Blown Head Gasket or a Cracked Block. Just in Case, Check all the Hoses and Check and see if your Model Has a Transmission Cooler Installed, Hopefully on of these is the Culprit. Please Rate My Response! Thanks!
SOURCE: 1992 grand Caravan 3.3 with 2 small coolant fans
There's a myriad of things to cause this.You need a wiring diagram, a hayne's manual,a test light, & good electrcal knowledge to find the problem.
SOURCE: 1991 honda accord the radiator coolant fan won't
If the cooling fan shuts off after a few minutes with the ignition off, this is normal for most cars; it prevents hard starting in hot weather.
If it fails to shut off after a reasonable period, say 10 minutes or longer, the relay for the fan may be faulty.
If doesn't come on during running and the gauge is in the normal range, this is also normal.
If it doesn't come on when the engine temp is above normal, the sensor for operation has failed.
This is normally located on the bottom tank of the radiator and will have either one or two wires coming from it and most have a hex base for removal and installation.
These are fairly common failures.
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