Hi,
this is a follow up to a post I placed a few weeks back. Below is a picture of my radiator, where I think I have a problem.

If you remember, my radiator fan isn't working unless the AC is on. The coper plug blanks off a hole where I think (not sure) a temp. sensor should be. Next to it is a bunch of wires (3 in total - power, earth, ecu??? again, only assumption).
Does the temperature sensor just screw in here and then connect to these 3 wires?
If someone could post the same picture of their radiator, just so I can compare, or just if you can advise, I'd be v grateful!
Thanks in advance