Thread: Rerouting the cowl vent tube

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1951 CHEVY 1/2 TRUCK

Has anyone filled in the hole on the fire wall where the cowl vent tube runs out and redirected it under the dash and out between the right fender and the inner fender? I have filled the hole and will soon be looking to see the best spot to drill through.
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John..........I have filled the holes in my firewall in my 50 Plymouth wagon as well. Am going to re-route the tube the same way,taking it to the right side and out. I am going to downsize the tube too, that way the hose can be smaller and easier to route.

If we seal the cowl vent in a effort to minimize the amount of water running into it, will that close off any venting of the tube and stop water from nunning through it? Just wondering...

What I did in my 40 Chevy was I connected it w/rubber hose to hard line then ran it over to the passenger side, down the kick panel & then throw the floor. Looked like a AC drain when I got done....joe

Originally Posted by John Brian

If we seal the cowl vent in a effort to minimize the amount of water running into it, will that close off any venting of the tube and stop water from nunning through it? Just wondering...

If you seal the cowl shut or weld the cowl close it will stop any water from going through that tube along w/losing the use of the vent....joe

Originally Posted by TooMany2count

If you seal the cowl shut or weld the cowl close it will stop any water from going through that tube along w/losing the use of the vent....joe

To late for welding. I'm all painted up now. My guess is the only way to keep water out is to weld and with that option out I'll just run the hose out behind the fender.
I still wish I knew for sure where to drill. It's like trying to find a stud in a wall without driving 20 nails to find it.

John I put mine right where the toe board met the floor up against the kick panel.

Originally Posted by TooMany2count

John I put mine right where the toe board met the floor up against the kick panel.

Will that put the hose between the inner and outer fenders? Also, could I put the hole a bit higher on the toeboard and still be within that area?

No actually it will be exiting through the floor board, but you could run it through the inner & outer fender if you like, it shouldn't matter as long as it's downhill from the vent drain tube so the water drains.
I'll get a pic later today to give you an idea where I put mine.
The pic will be from inside Large Marge BUT I will be doing the same thing w/that drain.
I will show you how I had(in the 40) & will have (Marge)the tube running to.
I will bend a piece of tubing to show you..joe

Originally Posted by TooMany2count

No actually it will be exiting through the floor board, but you could run it through the inner & outer fender if you like, it shouldn't matter as long as it's downhill from the vent drain tube so the water drains.
I'll get a pic later today to give you an idea where I put mine.
The pic will be from inside Large Marge BUT I will be doing the same thing w/that drain.
I will show you how I had(in the 40) & will have (Marge)the tube running to.
I will bend a piece of tubing to show you..joe

Thanks, a pic is worth a thousand words.

Now mind you this is just to give you an idea what I did before & will do w/Marge when done. You need to use the same size tubing as the drain tube for the cowl vent and use a piece of hose to connect the cowl drain & tubing together. I also used a rubber grommet where I put it through the floor. But I see no reason why you can't go out through the kick panel behind the fender. I have used copper, steel & aluminium tubing for the drains.joe

I Teed the cowl vent drain into the AC drain, and ran them both out the right side about an inch above the bottom of the toe board. I used 1/2" aluminum tubing painted black, and tucked behind the firewall insulation.

Thanks Joe.
I think I'll figure a way to use the largest size brake line and punch it out as high up on the toe panel as possible and drain into the area between inner and outer fenders.