Thread: Vacuum line...where does it go

To make a long story short about the dealership replacing my LIM gaskets, and horrible gas mileage ever since, I will just say that I went out and discovered that one of my vacuum lines was going from the t valve to nowhere. I believe it is the supercharger bypass line? It is the middle one. Not the big one, or the hard one. The vacuum line runs around the back of the motor and next to the battery then it is unhooked from something, but what? I drive a 2000 Pontiac Grand Prix GTP.

Thanks

also, could that have been affecting my mileage and performance or making a coolant smell?

to top it off, i just discovered while poking around it looks like its leaking worse now, all down the driver side towards the rear of the engine

nobody knows this one? I looked at the vacuum diagram and it didnt help

Originally Posted by chrizzle17

nobody knows this one? I looked at the vacuum diagram and it didnt help

Pictures speak a thousand words. And you only waited a couple hours.

Not trying to be impatient or anything, Im supposed to be leaving for a trip tomorrow morning and I was hoping I could fix the gas mileage problem before i go. I don't have a digital camera.

Your description isn't very helpful. What is the "t valve"?

The valve on top of the supercharger, at least I think Ive heard it called a valve after some searching. The one with the three hoses coming out of it, vacuum lines. The middle one or the hose on the long end of the T (the T is small too) is the skinny flexible one that wraps all the way around the engine bay and is one long piece ending somewhere around the battery area.

Ive heard this vacuum line called the supercharger bypass

That's not a valve, just a vacuum tree. The one in the center runs your HVAC blend doors. Supercharger bypass is the line coming off that closer to the front of the car.

NYMCGP

I found this It is the vacuum line he is talking about in this article

Yep, that's your HVAC line. It provides vacuum so your HVAC doors can move.

where do I plug it into and is that really the correct place for seafoam?

Honestly if anyone can just tell me where this particular line plugs in, it would really help. Thank you

Whats the vaccum line that goes to the tb or near the tb cause i broke that the other week and i just shoved the it back in the hose and it still isnt fully sealed and i think thats whats making my shifting going crazzy. Mine is a '99 gtp.

Originally Posted by chrizzle17

Honestly if anyone can just tell me where this particular line plugs in, it would really help. Thank you

I'd love to help but my Impala doesn't have vacuum operated HVAC. It's electronic, so I don't have that line to tell you where it goes. Going to need a GP member to actually go look.

yea I appreciate it, guess Ill just wait until a GTP owner wanders by, or maybe ill find it if i keep looking

It'll go back through the firewall into the passenger cabin at some point.