aftermarket radiator fan

So I have an after market radiator fan on the car when I bought it but the guy wired it up so I have to switch it on and off. So I was wondering if there’s a way I could connect those three wires shown in the diagram to my fan The fan on the car only has a red and black wire (aka positive and...

Right, then... So, in a few weeks, I will be picking up the 2000 2.3 I’m buying from my in laws. As it has 60k miles and has been sitting dormant for a couple, three years, I’ve ordered new cooling components (all front of engine- water pump, thermostat, clutch, radiator, expansion tank...