Sliding Glass Window Drains
(for those 64/5 2dr wagons)
Authored by Wes Vann, last modified on June 30, 1997
Am I the only person that has noticed that the 2 door wagons always seem to have the rear fenders rusted out. This doesn't seem to happen to the 4 door wagons.
Well, there is a reason. That reason is that the drain for the side sliding glass windows is a crappy design!!
The idea that Chevy thought would work is that the water that enters the sliding track goes into a trough inside the car. This trough runs from near the side door to the rear of the car along the lower edge of the side glass.
On 64's, there are two drains for this trough. One in mid run of the trough, and the other at the rear of the trough. The theory was that the rubber drain lines exited down below the fender. It's a reasonable idea, however, it isn't executed well.
The drain tubes had an oval grommet bonded to it, and it was this grommet that was to seal to the lower edge of the trough. This meant that in order for all of the water to exit, it would have to jump up and over the lip of the grommet.
When I disassembled my car, it looked like none of the seals worked from day one! Not only would the water have to jump up and into the tube, but the grommets never were seated correctly.
Due to the fact that there isn't a drain line at the front of the trough (on 64's), if the car has a rake with the front lower, the water will never drain.
Here is what I did.
I took some flat sheet stock and brazed a 3/8" diameter tube on
it. There are two holes drilled for mounting rivets. 
I had to make 6 of these. The reason for the bend in the tube was in order to have the tube go in the direction that I wanted.
At the front of the trough, I drilled a new drain hole and holes for
the rivets. I used silicone sealer on the drain tube fitting and on the
rivets. Then pop-riveted the thing together. I then covered the rivets
with sealer. 