Installing a 2 speed fan switch with a radiator hose adapter.
Bmw radiator fan switch wiring.
Attach one of the new wires to the positive wire and one to the negative cable and solder them together.
Just an idea on how to get the 2 speed bmw temperature switch installed on a classic gm or american vehicle.
The link below is a video on the wiring diagram.
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Remove 1 2 of covering from the positive and negative wires running into the fan motor.
The switches turn on the fan at low speed and then high speed as the coolant temperature rises.
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Cut the power and ground cables from the fan motor.