While I may have done a transistor-by-transistor analysis of the ECU and used pSpice to simulate the injector driver circuit, I've never done squat with my thermostat system. Basically, it works, so I leave it alone.
But I'm curious, how do the bellows work? When the car is hot, the bellows expand, and the cable tension is released. Is there an internal spring? Something about wax? Help me out here, thanks.