Thanks guys!

Arthur - I think its a switch. I have an multimeter and i'll check it out this weekend.
From what I can see, the two pin switches like the red one I show above and the blue one that looks like it, are switches that won't work with a coolharness. I am wondering now if the black-grey 3 pin switch that is on some 190's is the one that can work with the cool harness. If it is I'll get it and swap out my 2 pin one for it. I have no a/c so i'll just use the two pin side of the switch and leave the 3rd pin free. I don't know for sure.

I do know now that if you have a fan switch that does "double duty" i.e turn a fan on at low speed then kick it into high speed as the temp increases thats a switch that will work with the cool harness. The V8's have one on their auxilairy circuit for sure, and the cars with twin auxilliary a/c fans too. I can probably adapt one of these auxilliary switches to run my electro magnectic fan but I need to match the threaded shaft width so I can screw it into my head

Before anyone reading this asks...my cooling system is in great shape. I just hate the temperatures it was designed for!