• If you currently own, previously owned or want to own an Avalanche, we welcome you to become a member today. Membership is FREE, register now!

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

Huxley Farnsworth

New Member
Joined
Apr 15, 2022
Messages
8
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

This is a Custom Title
Staff member
Administrator
Moderator
Charter Member
PM 2023
PM 2022
PM 2021
PM 2020
PM 2019
PM 2018
PM 2017
PM 2016
PM 2015
PM 2014
PM 2013
PM 2012
SM 2011
SM 2010
SM 2009
SM 2008
SM 2007
SM 2006
SM 2005
SM 2004
SM 2003
Full Member
Joined
Jan 17, 2002
Messages
35,572
Location
Bourbon St. Balcony
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

New Member
Joined
Apr 15, 2022
Messages
8
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

New Member
Joined
Apr 15, 2022
Messages
8
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

Full Member
Joined
Mar 22, 2019
Messages
1,102
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.
 

Attachments

  • sunroof.pdf
    1,021.1 KB · Views: 4
Top