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The 'electrical warning light' is more likely telling you that there is a fault in the engine management system somewhere.A quick code read at an independant garage will point you in the right direction with this.
The fan could be the resistor pack,but it's unusual for them to intermittantly work,so it could be a fan motor getting hot or a blocked pollen filter which is making the system over heat.
I'd rather push my Alfa than drive a BMW....
Currently in Lagdti's garage:
2004 Saab 9-5 HOT Aero and a 2001 Audi A3 1.8 Turbo