Name This Gizmo

[Zulu Kono]

So far my Vortec 7400 injector/FPR replacement is going pretty well, but not without a couple of glitches. During the initial disassembly I either broke or finalized the breakage of this little tube, ~2mm ID, that runs from the driver's side of the plenum over into a little canister-looking thing on the passenger-side firewall under the AC receiver/dryer. Anyone know what it is so I at least know what I'm looking to replace?

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[Spareparts]

I believe that line runs the heater control valve.

 

[Zulu Kono]

I believe that line runs the heater control valve.

Thanks! I think you might be right because another tube comes off of that canister-looking thing and goes into another canister-looking thing where the heater hoses all connect. So the heater control valve must use vacuum straight out of the plenum. Maybe I'll just replace it with some plain old vacuum tubing.