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Radiator fan switch

Dec 27, 2009
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I've some doubt about the fan switch.

My MK3 came with air conditioning system then removed as car was mostly for track day use.
The original radiator was fitted with two switches, both connected, a black one with two pins and a white one with three pins.
Original radiator was too large and didn't allow a decent engine air induction duct so fitted a standard radiator... But the standard came with one only hole for the fan switch.

Questions are: do I have to install the two pins or the three pins switch ?
What to do with the connector that remains not connected?
What the difference between the two switches?

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