AC Thermostat Harness

Ive been working on getting my AC going and noticed that the ECU side of my AC thermostat harness (blue red) is just hanging under the dash. I Ohmed it to be sure and sure enough thats what it is. Where the hell does it plug in? Is the ac thermostat inside the evap housing?

Never mind. Mine was taken off by a previous owner and someone just left the probe hanging there.