Cowl Vent Tubes

[Rook E]

So the rainy season in south FL makes my mission critical. When it rains or I wash the car...I get a significant amount of water on the driver's side floor and some (but much less) water on passenger's side. Further review appears to show both cowl vent tubes on this 1976 are missing (see photos of no hose attached to cowl vent nipple on passenger's side and no hose exiting the floor board on the passenger's side) it appears I am getting less water on passenger's side because water drains into the heater defrost tube. So my questions:
- It appears the OEM tubes are not available,. Does anyone have a good alternative? Does anyone know the ID of the hose which will fit over the cowl vent nipple?
- Do the defrost hoses just sit under the dash with an open end?

Thanks for any help the forum members can offer.

 

[Rook E]

Floorboard

 

[65swb45]

IIRC Racer 65 is offering a repro in silicone.

 

[reddingcruiser]

^^pretty sure that's correct!

 

[Racer65]

Here's the link to the hoses on my site. However, I would caution that the mold for my hoses are based on part #'s 55767-60020 (LH) and 55759-60020 (RH), which are supposedly for '74 and earlier.

 

[shawnfj40]

RAcer what are you getting for your hoses? Here is what SOR is getting; https://www.sor.com/cat112.sor

 

[shawnfj40]

Here is the CCOT price; http://coolfj40.stores.yahoo.net/winglassealf.html

 

[shawnfj40]

And no the defrost hoses are connected at each end. One end to the heater and the other to the defrost l/r

 

[brian]

Here's the link to the hoses on my site. However, I would caution that the mold for my hoses are based on part #'s 55767-60020 (LH) and 55759-60020 (RH), which are supposedly for '74 and earlier.

They are routed differently from the 75 and later. The later ones pretty much drop straight down and into the top of the tranny hump.
I found metric heater hose that has a tight fitting id so I didn't need clamps on the cowl end. It also has a larger od so it fits nicely in the hump, because the rubber bushings for the bottom end are NLA too.

 

[Rook E]

Brian - Being mine is a 76...that is exactly how my tubes would be routed. Do you happen to know the ID or am I being ignorant of the term "metric heater hose?"

 

[brian]

i can look up the packing slip from were i got them from when i get home this evening. irrc i got one meter and cut it in half.
pretty sure the company is in the states, but yes it is german metric heater hose.



https://www.belmetric.com/index.php...ir44vr8q3sv2u0a3ig2oc6&keyword=rh18hp&x=0&y=0

 

[Rook E]

Brian - Was that link the same hose you used? ID of 18mm?

 

[Racer65]

Brian - Was that link the same hose you used? ID of 18mm?

I can tell you that ID of the pre-'75 OEM hose is 15mm.
It might seem small, but Toyota designed it to be a very tight squeeze so that no hose clamp is required. Check out Coolerman's photo of the old hoses he removed (this is from a pre-'75 truck). See how it's swollen up at the connection points to the left:

 

[brian]

Brian - Was that link the same hose you used? ID of 18mm?

yes, and irrc it was a pretty tight fit. i don't have any mechanical clamp on them.

 

[David70FJ40]

Once again you guys have provided information I was looking for. Not only do I need the cowl vent tubes but the windshield cushion that I accidently found when looking at the CCOT link a poster provided. A PO replaced the original with window gasket material that was glued to the cowl under the windshield. And very poorly done at that! Thanks again!

 

[brian]

go oem with the cushion gasket.

 

[Cleg]

I tried to replace the drain hoses on my '72 with a variety of plain tubing and ran into a few problems.
The original hoses had larger diameters at the end that connected to the cowl vent well.
There are some very tight bends that the hose has to make at the top end and on one side to get through the firewall.
The hoses I tried could not make the bends without kinking.

Here's another option.
I ended up using 1/2" copper pipe with soldered fittings to make the two sections to negotiate the bends and ran the straight sections with heater hose.
One short assembly to jog horizontally through the firewall and one with some more complex angles high on one side under the dash.
I painted them black before putting them in but the only visible portion is the turn of one elbow in the engine compartment.

 

[ErikinSC]

I replaced the passenger side a few months ago with the SOR tube, then I did the driver's side with an OEM hose from the local dealer... Sorry @beno LOL. I used a box wrench to loosen the end before I installed it.

 

[Racer65]

@Cleg @ErikinSC

Oh man...don't replace rotted hoses with the same hose that will rot again.
This problem has been solved. Check out my OEM shaped silicon drain hoses.

 

[Rook E]

I can't speak for other model years...but on my 1976...3/4" water hose worked well. Fit is tight enough that clamps are not needed. Doesn't hurt that the floor mats help "stabilize" the hoses. Onto the next project....