Erik, the plenum drains into the essentially closed section between the inner
and outer fenders. It is a stupid design to start with but it gets worse when
the plenum drains either get blocked or have a well around them where water
collects and rots out the area around the exit tubes.
If you get a flashlight and look under the dash, high up in the corners, you
will see where the plenum drains exit the plenum and connect to a short rubber
hose that drains into the inner/outer fender cavity. This is a notorious spot
for rotting out and all of the consequences that you describe. You can often
poke your finger through the rot and into the plenum.
A common strategy during a rebuild is to extend the drain hoses so that they
exit out through the baffle plates or through the bottom of the rocker panels
to allow the water to exit. I also retrofitted the metal flap to my 74.5 to
keep water out.
Stan
-----Original Message-----
From: 6pack-bounces@autox.team.net [mailto:6pack-bounces@autox.team.net] On
Behalf Of Erik Sulcs
Sent: Thursday, April 08, 2010 7:10 PM
To: 6pack@autox.team.net
Subject: [6pack] Water drainage tube in front fender...
Hello List,
In my '74 I've got water coming into the driver's side footwell when it
rains or if I wash the car. I know there's supposed to be a drainage tube
from somewhere under the hood/windshield cowl to send the water outside the
fender.
Perhaps mine is blocked or missing... how can I tell, and how can I get to
it if that's actually the problem?
Has anybody else had a similar issue and can help me resolve?
Erik S.
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