Help? what sensor is this?

[seab]

Hey guys put my engine back in this morning and managed to break this bloody sensor meh (the little black one above the brown one). Any ideas what it is? and where i can get one quick?

 

[RGM1800]

thats the selenoid for the aircon.

 

[Sheldon]

yep.. not a sensor... you can run without it for now or if you dont use aircon... just dont bother replacing it

 

[seab]

ahhhh i was just curious as it has a vacuum line connected to it, tempted to rip the aircon out anyway