So my old radiator was trash and I decided to replace it with a used SIR2 one from hmotorsonline. Everything fit fine but then I noticed that the old one has a small black sealed electrical box of some kind that the two wires from the fan run into and then back out of before they plug into the connector. It sits right on the upper passenger side corner of the radiator ans is attached by one of the fan shroud bolts. What is this thing and do i need it? The JDM replacement doesnt have it...it just plugs right in. I got it all filled back up with coolant and ran it for quite awhile but the fan never comes on but the temp gauge stays normal. Im going to go drive it around for a bit here in a minute to see if it does anything.