1989 744

I have my sunroof off looking for the reason water came into cabin in a recent rain.

Front drains are open, but rear ones may be clogged, so I am trying to locate where they exit the car.

The FAQs and such say they come down the "C" Pillars and exit aft of the rear tires, but not sure if I've found them.

Water was coming in my manual crank handle, and I found the sealing on the rail-to-tub around the cable mechanism was deteriorated (See photo at Copy and Paste Link: http://screencast.com/t/ZfRq9WT2A ). That allowed water to get into the crank-and-cable area.

Picture of Crank-Cable Area: http://screencast.com/t/ZfRq9WT2A

Picture of left side "C" Pillar in the vicinity of the Rt trunk Hinge link at : http://screencast.com/t/gme5IyW0

Arrows point to green-painted steel lines coming down of L. C-Pillar, but one (green arrow) connects to gas filler pipe. Red arrow points to tube that disappears under trunk area. BOTH of these seem like fuel vents?

Picture of RIGHT side Quarter Panel: http://screencast.com/t/7iERKnIcZ

The fat black hose on left (green arrow) drains area behind rear window. The hose on right (that join in a plastic "Y" and exists behind RR Wheel) disappears up in the "C-Pillar" so I am guessing it may drain the rear sunroof area?

This one (See Red Arrow w/ "??" in photo http://screencast.com/t/7iERKnIcZ ) may connect to rear sunroof drains? If so, do the rear drains connect together somewhere out of sight and combine to flow down the right side C-Pillar?

I disconnected the "red-arrow" hose at the plastic fitting and had a helper BLOW into the bottom end of the hose. It was wide open (no resistance to air-flow) and placing my ear at each rear corner of the sunroof opening (lid removed) I could clearly hear the rush of air coming between the headliner and the metal top of the car. Hopefully that's a good test if that fat hose DOES connect to the sunroof drain hoses?

Any suggestions appreciated.

BTW- Anyone know what the black plastic box with wires on both ends is that I labeled w/ a red box with a "?" in the Left Upper Quarter Panel?