What are these different vacuum lines going to?

[jcook100]

Hello,

Can someone explain what each of these vacuum lines is going to and what their purpose/function is?

#1 - Goes down into a bundle of wires just above the air box
#2 - (Disconnected) - Goes directly into the air box
#3 - Goes into some sort of cylindrical canister up near the windshield
#4 - Sits on top of the engine, between the passenger side valve cover and the intake manifold, and enters some sort of valve (?) that has a braided line coming out of it

Also, as you can see in the one picture, the lines going to #1 and #3 actually start as a single vacuum line that has a "T" split in it. Is this normal or was it jerry-rigged at some point?

Thanks!

 

[BlackBII]

Not sure about 2, but #4 is for the fuel pressure regulator, #1 goes to the blend door under the dash, #3 is the vacuum canister

 

[SenorNoob]

Both lines at 2 are for warm air intake. One should be vacuum source. The other goes to a valve to move a flap to pull intake air from very near the passenger side exhaust manifold. For quicker engine warm up.

 

[jcook100]

Not sure about 2, but #4 is for the fuel pressure regulator, #1 goes to the blend door under the dash, #3 is the vacuum canister

Thanks! Can you explain what the purpose of these two are? The blend door and the vacuum canister?