what's this vacuum hose for???

[allensteiner]

seems to be going down somewhere by the transmission, was hooked up to the stock intake and since i left it unhooked no codes popped up, no issues. so...what's it do???

[blueis300]

my 07 has a hose also. Thought it was just to vent stuff off I read.

[allensteiner]

that's what i thought i was affraid it was imporant.

[Presscott707]

its to vent air out of the head.

[Ignacius_Rebenga]

it's EGR/PCV

Exhaust Gas Relieve/Positive Crankcase valve

Releases remaining exhaust gasses via channels in the block way up to the head, and can be rerouted to the intake for air pressure purposes

[allensteiner]

Presscott and Ignacius - i'm talking about the little one which ends over the coolant hose. just a small diameter vacuum hose...i think you guys are thinking the one with the breathe on the end.

[blueis300]

pcv is what comes out of the crank case and he has a filter on that. If it comes from the top of the transmission its a vent.