Coolant Temp Sensor Wire Missing

Hey everyone, I have a 94 Seville that with a current OPEN COOLANT TEMP SENSOR trouble code. I got down there and moved the egr tube aside and found that the sensor was not even plugged in. And furthermore I cannot find the wire and connector anywhere! I have no idea how this even happened and I am guessing that it may have come loose and may be hanging somewhere out of sight and out of reach.
My question is what wiring harness should it be coming from, and where is it located.

Any reply would be greatly appreciated.
Thanks.