Electric Fan
The ECM drives the electric fan via relays (see relays in front power distribution box). A resistor is connected in the supply line for stage 1 at the electric fan for the purpose of reducing the voltage supply of the fan in stage 1. In stage 2, the system voltage is fed directly to the electric motor of the fan. Corresponding to requirements and depending on the coolant temperature, the ECM drives the corresponding relay and thus influences the speed of the electric fan. The pressure sensor for the air conditioning system also has an influence on the drive of the electric fan.

Hope this helps.
Ken

Yeah, I'm there... And a few others.
Thanks for the info.

Ken from Mini Mania is very good with the BMW MINIs. He'll respond Monday.

better success here:

https://www.northamericanmotoring.com/forums/

Hello all, this is Tim. New to Minis but not new to British... Can anyone confirm that this cars cooling fan is a single high speed, not a low/ high speed? There is only a single hot and ground plug to fan, not 3 leads like others. Although there is 2 relay slots for low anf high speed, this car only had a high relay in the fuse block...
Also, manual says upon starting car, the fan should come on briefly then turn off. My car doesn't. High speed only comes on when AC is activated. Concerns me as I bought car last year with a blown head gasket, spent many Saturdays and Sundays to replace it. Got her running great but concerned that she is not as cool as she should be...
Any advice on this? 
Thanks