Help 2 identify - hose/cover

[Casper42]

Can oneone help identified the sheath/tube/cover? inside my 72 C10 w/ 350/350 with air, I came across this tube about one foot long, which I first thought was a vacuum hose, but it turns out to be a soft rubber tube as there's a slit for easy inserting a wire or the like. It goes into the firewall via a grommet, just under the passenger side wiper arm. Does anyone have a clue what it is/was, or the intended purpose? thanks

[Stocker]

Only a foot long and slit -- I wonder if someone placed it there to cover (and protect) the vacuum line going to the water valve and (via a tee) to one of the A/C dashpots.

[Casper42]

Originally Posted by Stocker

Only a foot long and slit -- I wonder if someone placed it there to cover (and protect) the vacuum line going to the water valve and (via a tee) to one of the A/C dashpots.

ironically, my water value has been removed, making it a manual adjustment in the engine compartment to close off the hot water flow (North Carolina truck until recently). Are you suggesting the "vacuum line" to be a metal tubular line that was covered by this rubber sheath that went thru the firewall at the location shown in the picture?

[Stocker]

Originally Posted by Casper42

ironically, my water value has been removed, making it a manual adjustment in the engine compartment to close off the hot water flow (North Carolina truck until recently). Are you suggesting the "vacuum line" to be a metal tubular line that was covered by this rubber sheath that went thru the firewall at the location shown in the picture?

No, my vacuum line is a small rubber hose that comes through the dash in the same place you have pictured. No metal line there. I believe it comes directly from the A/C controls on the dash.

[LockDoc]

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If it came out of the grommit on the drivers side I would say it was for the oil pressure line. Some of them had a rubber sheath on them.

LockDoc

[BanjoDude]

That sure looks like a cut-off piece of old windshield wiper blade.