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The power is supplied by a transformer, and when the thermostat makes contact between the 24 volt power and one or two of the other wires, a relay back at the heating/cooling unit activates the corresponding heat/fan/cool function of the unit(s).
The thermostat on the S-10 in general is mounted to the engine and serves as a door that opens only when the engine reaches a certain temperature. A faulty thermostat that is stuck closed will prevent coolant from leaving the engine and will cause the engine to overheat. The exact opposite is viable as well; a thermostat that is stuck open will constantly allow coolant to flow, often causing the temperature to never reach over 100 degrees.