Raining in my heart, and Avalanche - SUNROOF DRAIN LINE LOCATIONS

[Huxley Farnsworth]

Went out today opened the drivers door and saw a very wet seat. Checked the windows, they were all up, looked up to see a very wet headliner. I have had experience in the past with leaking "rainroofs" we used to call them so I knew it was a drainage issue. I opened the glass and opened an umbrella over the hole, because it was still raining. Got my small shop vac, made a reducer plug in the end of the hose with a piece of 3/8" clear vinyl tubing about 6 inches long. I vacuumed out the channel area and then tried to slide some .090" trimmer line down the driver side, It went in about 4 inches. I then put the tubing over the driver drain hole and it vacuumed a lot of water out of the drain. I could see the water through the tubing. Then I reinserted the trimmer line and it went in about 4 feet. I was afraid to put 100psi. shop air in the drain in case it would blow any union off the drain line in a place I did not know.
I want to know where the drains exit the body. I would not be apprehensive of pressurizing that point. 2102 Avalanche.
Anybody? Bueller? Bueller?

 

[ygmn]

about in line with A pillar @ fender but down low near truck bottom.

I lso think set from rear of sunroof goes down B Pillar.

 

[Huxley Farnsworth]

Yes you're right about the locations of the drain hose routing. I pulled the cover off the driver side A pillar and i can see the drain hose and I believe it goes to a junction under the dash by the toes.
The B pillar drains are totally hidden by the rainroof slides. Too bad, because I really like this truck except for that. I have driven it in rain before and no leaks.
Somebody lubricated the sunroof slides with a waxy substance. Pehaps some of that fell into the drain system.

 

[Huxley Farnsworth]

Well, really good news. It rained yesterday. Torrential downpours. I left the inside roof shade open all night. She sat in the driveway. When I opened the door, the seat was dry. I drove through hard rain for about 50 miles and two things happened. The roof did not appear to leak, and no water ran down my neck. Looks like the perfuctory cleaning I did the day before worked.
I'm much happier.

 

[BainMan]

Glad you got it fixed up!

For the next person, see attached for the service manual. Also the thinner weed eater string works better for me. I think it is .065 and can snake all the way down to underneath the truck.