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As was mentioned, any electrical component can fail in either an energized or deenergized position. If it fails closed, then power will be flowing through it all the time. If it fails open, then no power will flow. Also to mention, the TDM can fail while energized, thus preventing the fan...

If the thermoswitch fails and is energizing the circuit, then it disables the fan. When there is no power through the circuit, the fan is engaged. In other words, applying power through the switch turns ON the cadillac valve, which in turn disables engine power to the fan (fan still spinds...

Yes, the 2 wires going to the cadillac valve from the TDM. As mentioned above, doing the positive wire is better as it kills power to the valve. Normally, yes, most things that would cause a failure of the fan circuit will leave the cadillac valve without power, and therefore the fan engaged...

Yes, you can wire in a switch. All you need to do is interrupt the power to the cadillac valve, so if you want to do it at the thermoswitch circuit, or right at the cadillac valve, it should work the same (though if the TDM fails it can prevent the fan from engaging, so at the cadillac valve...

yes, all you would have to do is wire to a 24V source then to the hot side of the cadillac valve wires. Would be a relatively easy/straightforward wiring job.