VCCA Home Forums TECHNICAL - 1945 AND EARLIER 1912-1928 1928 copper line above windshield. What is it?

I posted it in general by mistake, so moving it to here. Probably obvious to the experienced restorers. On the 2-door that I just got there is a 1/8” copper line that exits above the drivers side windshield. On the inside it is inlet into the wood and snakes down the driver’s front roof pillar. About 2’ of copper inside under the dash not connected to anything.

Just a WAG, is it for a vacuum operated windshield wiper?

The line above the windshield:


The line at the left roof post:


The dash and gauge panel:

That would be my guess as that is how the line for my 32 is routed though my line was steel.

Same as my 29, windshield wiper. There should be a valve mounted in the dash to the left of the gauges.

There is a valve on the dash. Looks to be in good condition, with no corrosion on the zinc casting. Just no ferrule nuts for attaching the tubing. And haven’t found a wiper motor in the pile of parts yet. Did find one short wiper arm.