Vacuum line identification

[chmurphy]

Hello, can anyone help me identify this hose? Several vacuum diagrams I've looked at didn't seem to show it. This is on a 86 Silverado 2wd 305.

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[C10MixMaster]

Hello, can anyone help me identify this hose? Several vacuum diagrams I've looked at didn't seem to show it. This is on a 86 Silverado 2wd 305.

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Im pretty sure it supplied vacuum to the heated air intake that is missing from you air cleaner snorkel

 

[SirRobyn0]

Im pretty sure it supplied vacuum to the heated air intake that is missing from you air cleaner snorkel

Looking at the pic where it is running rearward, like C10MixMaster said it could have run to your thermac (the missing air cleaner snorkel thing), or most of the 80's trucks had vacuum operated heat risers in the exhaust manifold. My truck is like that and the vac line looks similar to what you have going.

 

[chmurphy]

Great, thanks for clarifying. Much appreciated!