Yeah air would come out of the IC pipe. I meant you could leave the Idle up valve not connected to anything and it would still work, but not a good idea as when it opens it would be letting un filtered air in 
 
You should have another idle up valve bolted to the bottom of the intake. You could T it into there

Artymr2 - interesting. Where do your two ac idle up vacuum hoses go?

Not sure I would have to check. Where is the AC idle up located? I thought the idle was all regulated by the throttle bypass valve?

Cheers

MIDN1T3
Track_mr2 - The original ac idle up vacuum hose ran to the hotpipe which is before the throttle butterfly. So you're saying I can put it after the throttle butterfly? (just double checking we are on the same Page lol)

Anyone out there with a Gen 2? I'm really interested in seeing where the vacuum hoses. I know one goes to the bottom of the intake manifold, where does the other one go?

Mines a gen 3. It has a hose coming out after the throttle body (on the back left) of the intake plenium going to the idle up. The other end goes back to the intake.
 

Lol, now im with ya. You lost the intake side connection when you changed intercoolers. Sorry I thought you we after the connection to the intake plenium. Yeah so anywhere before the throttle body is fine. If it were me I would drill and take a connectioin to the intake. Yeah leaving your intake side idle up not connected will work fine but as dasic1 said it can suck unfiltered air which isn't ideal. The other option is you can put a vacume line filter in. then leave it not connected to anything if you really want to avoid drilling anything.

Thanks for all the replies guys.  However, I think pictures will clear up exactly what I'm asking...because I'm still confused lol.
 
So, I'll start right back from the beginning :)
 
This is my old Gen 3 hotpipe with the vacuum nipple that goes to the AC idle up sensor.

 
I no longer have this hotpipe because I put in a new intercooler set up.

 
Now here is the AC idle up sensor with the wires on top and the vacuum hoses on the bottom.

 
The vacuum hose on the left goes to the bottom of the intake manifold AFTER the throttle body.

 
The vacuum hose on the right (used to go the hotpipe) is here...

 
Ok - so I left this above vacuum hose unplugged, and it let out boost and hence I don't hit full boost. 
 
So my question is, since the Gen 2 does not have this nipple...

 
yet has the exact same AC idle up sensor with two vacuum hoses, where can I re-route mine easily? (Also, by the sounds of it, Artymr2 Gen 3 does not have the nipple either, so where does yours go mate?)
 
Thanks Dasic1 for your suggestions, but I don't think it can go before the turbo as I would still lose boost.  And my new intercooler set up makes it hard to put a new nipple in between the turbo and the throttle butterfly.
 
 
 
 

Hi. I don't think you should be losing boost. The idle up for the AC is supposed to be a one way valve to suck in air.
It controls the amount of air bypassing the throttle body, thus controls your idle and has the ability to raise your idle speed when the AC is on. It shouldn't be opening all the time. Also its such a small hose that even if it did leek boost it wouldn't effect you making full boost. How many PSI are you running? Like if your only running 16psi or less the gen 3 tirbo will easily spin fast enough to hit that boost with the pipe disconnected. Try blocking off that pipe and seeing if you hit full boost then. Anyway as for routing it after the turbo, you will probably be best to have that metal BOV adapter (pipe joiner) modified to take a fitting you can plug the hose into. My Gen 3 has a fitting just under the BOV after the turbo.
 

I would just make a new fitting somewhere in a similar position, after turbo, pre throttle body.
Edit: what track_mr2 said, drill and tap a fitting on the BOV joiner pipe

track_mr2 - Yep, I plugged it up and it hits full boost.  It will even let air out by just revving the engine, so maybe there is something wrong with that one-way valve?
 
Senor_2 - Yep, I did initially look at getting a nipple welded onto the BOV metal joiner, just thought there might be an easier way haha.
 
 
 
 

Yeah sounds like something is wrong with the valve