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The air conditioner blower motor is located on the firewall in the engine compartment in 2000 BMW 528i.
sounds like a bad blower motor resistor and or plug
the blower motor is behind motor on fire wall must remove your radiator fill bottle .carlo puchades
A BMW dealer...
In the fuse 76 socket.
Behind the firewall on the back side of the engine.
fuse 75 should go to electric fan, and fuse 76 should go to ac blower final stage blower resistor
To change out the blower motor in this car disconnect the battery ground and then carefully remove the long plastic cover that is mounted in the engine compartment at the top of the firewall. The blower motor is easily accessed as is the resistor board below it for the lower fan speed selections.
It's one of the fuses under the hood on the passenger side.It's a 30 amp fuse as I recall
The blower resistor board is mounted underneat the blower motor. They are both accessible by taking off the long plastic cover at the top of the firewall from inside the engine compartment.
Look in the e38 forum and it will give you a detailed account of how to do itType your answer here...