My radiator fan is turning on and doesn't turn off, even though the temperature gauge is showing the temperature to be fine. A couple people posted it sounds like a faulty fan switch. New switches seem to be running about $70. I would like to test my switch somehow to see if it is indeed the switch before buying one. Does anyone know how to do that? Has anyone encountered this and been able to fix the switch, maybe due to a bad connection, corrosion or something?Thanks!