Sensor in Coolant bypass block

[KJO]

Hello all,

I bought a 93 4Runner with a blown head gasket. I replaced the gaskets and now cannot find a specific sensor wire--I know it sounds ridiculous. Anyway, the sensor is on the coolant bypass block and is round and a blueish color. Does anyone know what this sensor is for and where the wire/connector comes from that goes on it. It would seem like the wire would come out of the harness on the L side with two other sensor wires that connect back there, but I have searched the world over and can't find that wire/connector anywhere. I'm pretty sure I took it off--been a few weeks since I disassembled it--and the sensor looked clean like it had been covered so I'm assuming there was a connector on it. There is a pic of the sensor in question below, circled in black. Any suggestions would be greatly appreciated. Thanks

 

[KJO]

BTW, it has the 3.0 if there was any question.

 

[early88]

The plug to that sensor comes out of the wire harness right after the plugs for the fuel injectors and knock sensor on the drivers side. I dont know how to post pics on here but if youd like to pm me your number i can text you a pic i have my motor tore down right now to replace the heads and i know exactly where it is if you need more help.

 

[KJO]

I was sure it came out of the harness in that area also, but it sure isn't there. I can't even find a broke wire where it might have broke off. I'm very perplexed.