The 4AGE thermo fan switch circuit is a 'normally closed' circuit. ie when the thermo fan switch circuit is opened the actual thermo fan circuit becomes closed and therefore the fan turns on. So by unplugging the switch you are opening the switch circuit and thus closing the fan circuit.
Basically, your thermo fan switch is stuffed.
HEL can make custom ADR approved braided brake lines, pretty cheap too. I think I paid $130 for mine.
Edit: forgot to mention you have to specifically request them to be ADR approved.
I've heard of people pouring oil inside exhausts to keep them from rusting out while they're being stored. My dad actually bought a second hand exhaust that had had this done to it, there was so much smoke and shit coming out when he first drove it lol.