Help with these vacuum lines.

[bishir]

These two vacuum lines that go under the heater box I assume are for the ac door operations correct?

One comes into a check valve into the engine compartment which also appears to connect to a vacuum source an other items like cruise.

The other just seems to go this fitting.
This fitting goes?

 

[sparky0798]

I believe that one goes to the heater water valve. And yes the other one goes to the check valve on the firewall behind the egr valve

 

[bishir]

That's it! The heater valve makes sense, thanks!