E46 320D 2000 electric fan does not switch off, runs all the time. Connector voltage?
Hope you can help. My electric fan runs all the time, so i have to pull out the big 50 amp fuse everytime. I sent it to BMW but i am not convinced they fully diagnosed the issue. The fan remains on whether the a/c is on or off. I have done a test on the voltages going through the connector that goes to the fan shroud. I did it the next morning so the engine was cold.
I am referring to the connector which powers the electric fan, there are 3 wires, the one is main power(red), the other is earth(brown), there is also a black/green wire and this is the wire i am trying to figure out, i think this is the signal the system sends to the fan to control the speed, am i correct? And i assume the higher the voltage the higher the fan speed.
I disconnected this plug from the fan, and used a multi meter plugged into these wires. Positive from the meter connected to the black/green wire and earth on the brown wire. The voltage is around 5.6volts on this wire and when just started, and when the temperature gauge reached maybe just one needle width passed exactly half on the gauge, the voltage was around 5.8v. Is this normal, i was expecting a rather large variation. I tried googling and could not find anything.
Any help on this matter is appreciated