Hey guys, nice to be back... wrecked my 2010 S model sedan back in 2020, and only recently picked up a 2013 xS model sedan. It seems (I *think*) to have a driver's side sunroof drain grommet leak. I want to try tying into the a/c condensate drain to fix it. Want to make sure I order the right tubes and barbs. I've seen some reports of 3/8" tubes for all of it, some reports of 1/2" tubes for all of it, and some reports of 3/8" for the sunroof drains and 1/2" for the a/c drain. I'm sure plenty of guys around here have done this fix, and I'm wondering what you've observed.

Also if there are other possible complications I should look out for... cautions about trim removal, or delicate things to be careful around when snaking the tubes behind the dash, etc. Any and all tips greatly appreciated.

Thanks guys!

 

This post has the materials you will need but for continuity:

3/8" ID (Inside Diameter) tubing;
3/8" straight barbed fitting(s);
1/2" x 1/2" x 3/8" t-fitting (if tapping into passenger AC drain hose).

Routing the hose is relatively easy though I would strongly suggest you wear a pair of gloves. There is a lot of sharp metal edges and you will slice a knuckle or two.

Other than that just route the hose so there are no obvious kinks or chances for the tubing to get sliced (again, lots of bare metal).