Dart "Cool Aire" A/C

Silicone spray lubricant is very bad for electrical switches. It may be too late. Perhaps use CRC electrical parts cleaner. It can be found at auto parts stores. I learned this at MicroSwitch, where silicone spray was forbidden from the plants.

There is nothing too fancy about compressor control however it takes several amps to engage the clutch. When cool enough, the thermostat opens the connection. The clutch is very inductive, so opening load is hard on switch contacts. The on off switch is in series, the fan switch powered to run any time for circulation. The fan should always run if a/c is on.

Thermostats easily fail if constantly adjusted, the diaphragm work hardens. Best to leave set. I would wire in a 30A Bosch relay to save the thermostat contacts. Battery to 30, clutch to 87, 86 to thermostat where it would have supplied clutch, and 85 to ground.