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I assume you mean the radiator fan. This might be indicative of a different problem. The main issue is, does the car overheat? If not, then it's probably a thermostat that's stuck open. A lot of things can fail in the fan system...the fan motor itself, a fuse, a relay, or the temperature sensor that tells the fan to turn on.
BMW has the central body electronic zkev system.its computer control or control by a control module .if you replace battery or move battery.it put wipers in sleep mode.the BMW dealers is going to have to reset it to get wiper going again.
try looking for the relay box and listen to each relay the one that clicks when the wipers are on
is the one to take out and replace it with a new one or second-hand one but make sure to turn off the car first .
there is not much to it you should have 3 wires coming from the front to the back ones a ground the other two run the motor and pump i can almost guarentte it is a relay because they go out very often replacew then tri again