Sunroof drain hose inner diameter

[PapaGoose08]

Does anyone know the inner diameter of the sunroof drain hose?

My driver's side front drain was chronically clogging, so I inspected it through the A-pillar and found the hose had been pinched between the roof and headliner. It's been like that for so long that it doesn't want to return to its normal shape. I was thinking I could cut it and insert a rigid coupling as a stent so it won't collapse again. The outer diameter seems to be about 5/8 inch or 15 mm, so I am guessing the inner diameter is 1/2 inch. However, I'd like to confirm the inner diameter before I start cutting things so I can make sure I have an appropriate connector.

I searched for the part, but it seems to be discontinued maybe because it is just standard hose material.

 

[PapaGoose08]

For anyone who has troublesome sunroof drains, you may want to check that they aren’t pinched. I could never get a weed whacker line past the first 8 inches or so.

I added a 1/2 inch nylon hose barb where the pinch occurs and it’s made a huge difference in drainage.

The channel where the hose runs between the sunroof pan and the A pillar is barely big enough for the hose. So if the hose gets positioned incorrectly, it gets pinched. Mine had been like that for so long they were permanently deformed. The nylon hose barb should keep it from happening again.

I had to remove the trim on the A pillar and remove the sun visor to pull the headliner down just a bit. I replace the first 8 inches or so with 1/2 inch inner diameter clear vinyl tubing because there was a secondary pinch as well.

 

[Malleus]

Does anyone know the inner diameter of the sunroof drain hose?

My driver's side front drain was chronically clogging, so I inspected it through the A-pillar and found the hose had been pinched between the roof and headliner. It's been like that for so long that it doesn't want to return to its normal shape. I was thinking I could cut it and insert a rigid coupling as a stent so it won't collapse again. The outer diameter seems to be about 5/8 inch or 15 mm, so I am guessing the inner diameter is 1/2 inch. However, I'd like to confirm the inner diameter before I start cutting things so I can make sure I have an appropriate connector.

I searched for the part, but it seems to be discontinued maybe because it is just standard hose material.

It's metric tubing, and I haven't found it anywhere, except a salvage yard. The front and rear are the same tubing, just different lengths.

I replaced my 80 series front tubing with two sections (one on each side) of rear tubing, after I soaked and thoroughly cleaned them in soapy water. Now they run out of the floor, behind the running board, where they should have been all along. This is on the list of changes to be made on the LX470.

The ID is 11-mm.

 

[NB100LC]

How about this?

McMaster-Carr

McMaster-Carr is the complete source for your plant with over 595,000 products. 98% of products ordered ship from stock and deliver same or next day.

www.mcmaster.com

20' 11mm id, 16mm od, clear.

If someone tries it let me know if it works. I'm pretty sure my sunroof drains are compromised as I always hear gurgling sounds from there when it rains.

 

[PapaGoose08]

@Malleus thanks for confirming. Not surprised to hear it is metric. It was a little off but the 1/2 in vinyl tube and the nylon hose barb seem to work.

 

[Malleus]

How about this?

McMaster-Carr

McMaster-Carr is the complete source for your plant with over 595,000 products. 98% of products ordered ship from stock and deliver same or next day.

www.mcmaster.com

20' 11mm id, 16mm od, clear.

If someone tries it let me know if it works. I'm pretty sure my sunroof drains are compromised as I always hear gurgling sounds from there when it rains.

The reason it gurgles isn't that it's dirty. It's because the water has nowhere to go once it reaches the end of the tubing. It has to fill up the pocket between the inner and outer fenders and then flow into the rocker panel, where it then flows out through the drains, if it's lucky.

Toyota figured out too late that this magic drain system wouldn't work and didn't fix it until far too long after that. That drain tube should go through the floor, the way it does on the 120 series.

Replacing the front drain tubes with rear drain tubes will give you the correct size to match the nipple on the sunroof drain pan and extend far enough to get through the floor and hang below the body, so the water won't wick up and rust out the floor pan.