So I've been digging around under my dash, looking for a good spot on the passenger side to put the vacuum line through. I noticed this hose going from the side of the transmission hump to the box that connects to the blower motor (I would assume the heater box). I unplugged it, and didn't get a facefull of coolant, nor did anything else happen. Would it be a bad idea to pull that hose and put my vacuum line in its place? If so, where is the easiest place through the firewall (i.e. somewhere i don't have to rip my dash apart)?

 

pull through where the throttle goes through.

 

Vacuum line for megasquirt?

Just use the same place outlined in the PNP install.

 

word...didn't think of that one...

 

that line is the AC condenser drain. if you have AC you'll see what it does come summer when your passenger footwell is flooded.