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I have an unidentified wire that's seemingly out of place. I do not know what it does temp sensor maybe.

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The wire is a thermocouple wire sensor.
Look closely, (it is safe to touch).
It loooks like a bare copper wire. It is actually two wires (thermo "couple"). A tiny electrical charge will flow from one of the metals to the other when heated... that makes is a good way to measure heat (or coolness). Works just like a thermometer.
It needs to be placed in the return air duct or condenser so that the thermostat can be triggered when the coolness setting is reached.

Posted on Oct 01, 2009

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Posted on Jan 02, 2017

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I don't know about the issue of replacing the thermostat because I don't know which engine you are working with. So let me know an

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