Well, there are 4 coolant temp sensors.
1 is technically a radiator fan switch and plugs into the radiator under the coolant fan. 1 single wire connector that runs the gauge in the dash, a 2 wire staggered pin connector that is the ECU's coolant signal next to the gauge sender and a side-by-side 2 pin that is used for A/C control at the top thermostat housing.
Wiz