Im putting my motor back together after stripping it down for my single turb build, and ive decided i want to keep the IAC - the only thing is i cant remember where the lower hose goes to (see photo). I vaguely remember sawing some hardline that had coolant in off lol, im guessing i need some hose but where would i rout it too?

 

That goes to the collant filler neck.

Pic by Moe, not mine.

 

You can see it in the diagram below

 

Perfect, thanks for the responses guys!