radiator fan quit working. What could the problem be? on 1992 Ford Escort

I put in a new relay switch and was told to get a thermostat switch, but can't find where that is located.

Asked by for the 1992 Ford Escort
Start with the basics, meaning test the fan motor it self with 12 volts and a good ground. Then go from there. This vintage Escort uses the Coolant Temp Sensor to trigger the fan. Does the fan come on if you turn on the A/C?
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