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On my Twingo I it comes on over 100°C and in low speed, high load situations that engine while hot doesn't run very well. I'm planning do add a bypass to turn on the radiator fan when I need to (doing mountain roads with little Twingo)

You can easily see, if you don't have a multimeter, that the AC relay is working if you see the radiator fan running in low speed mode when you activate the air conditioning. Note that to activate air conditioning you need to activate both ventilation and AC button.

In Twingo 1 there are two speed for the radiator fan, done with a resistor placed on the radiator. In that car there are two relays, one for the high speed mode of the fan and one for all the AC system and the low speed mode of the fan, I would assume the Twingo 2 it's the same.