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.

 

[styran]

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.

Sorry to revive a dead thread, but I have had countless issues with my sunroof.
The first time it failed, several years ago, in my families ownership, the dealership replaced the entire tray ($5000+) and did not even clean the drain hoses.
So, it leaked & the sunroof failed again, and my focus changed from getting the roof to work to stopping it from leaking all over the cabin.
Plus, as as bonus, the "experts" stripped bolts, installed seat belts backwards, and broke countless plastic clips and did not even replace them.
I found the issue, almost all 4 drain hoses are extremely pinched in several places and there is hardly any flow through the hoses.
Unpinching and cleaning them fixes it for maybe a month if I am lucky. I will need new hoses.
About to order all the parts ($600+) to drop the headliner and replace the sunroof cables/guides one last time.
I do not want to come back. I am not looking for a patch, I am looking for a permanent solution. An upgrade from factory
Front hoses are $30 and rears seem discontinued. Either way, that's a lot of money to replace clear plastic hoses with the same thing that failed in the first place. Like I said, I am not looking to revisit this.
Measuring the current hoses is a bit tough as they are 25+ years old and stretched quite a bit. I am not confident in my measurements of the hoses.
Wondering if anyone has had any luck with the McMaster-Carr hoses?
They have thicker hoses for $3 per foot.
Maybe the thicker hoses will prevent future pinching.
Love to hear anyones thoughts.

 

[Malleus]

Thicker material will not solve your problem. Use the OEM hoses you have and route them so that they will not become pinched. This is possible, becuase it's the way the system was designed, and literllay thousands of trucks were produced this way. In a very few instances, someone missed something, or installed a plastic trim piece improperly, and you have what you have.

If your hoses have taken a set, over the years, slip a wooden dowel in them and warm them with a hair dryer or heat gun on low. Let them cool with the dowel in place. This will fix the crimp problem.

If you want to replace the front hoses, by all means, do so. It'll at least be clean.