Where does the hose for this fitting come from?

[Driftin]

Looking at the front of the car, right side of the engine block all the way at the back, just below the intake manifold studs, so top back corner of the block, there is a fitting for a small coolant hose. Anybody know where the hose for that fitting originates? I can't find the hose, and may need to route a new one, but I don't know where it is supposed to go. I had my engine out and tried to label everything, but I obviously missed one.
Thanks!

[flyboyx]

this orifice goes to one of the hoses on the firewall for the heater core.

[Driftin]

But it is significantly smaller than the heater core lines.

[dustyperez]

it goes to the throttle body

[Kershaw]

i bypassed my throttle body. im not a huge fan of heating the air that goes in my engine.

[nando]

i bypassed my throttle body. im not a huge fan of heating the air that goes in my engine.

the amount of air heated by the TB heater is beyond insignificant.

[Driftin]

Throttle body is correct! PITA to tighten.

[Kershaw]

the amount of air heated by the TB heater is beyond insignificant.

that is absolutely true.

(i really did it because the gasket was leaking and was too lazy to replace the gasket. thereifixedit.jpg.)