Discontinued coolant hose keeps leaking - options?

[The Critic]

Application: My dad’s 92 Toyota Previa, non-supercharged.

There is a coolant hose that connects to the water pump housing and the factory used this exact clamp to secure it:

The hose was removed and reinstalled due to a water pump replacement. The hose was in reasonably good condition (for a 31 year old hose) so it was reused. I tried to reinstall the clamp in the same position but was not 100% successful.

The vehicle idled for an hour for system bleeding and the hose did not exhibit any leakage. However, after the system cooled down, a major leak occurs. By major, I mean 2-3 quarts of leakage in an 8 hour period. I tried tightening the clamp and/or repositioning it, but experienced the same outcome - no leaks when the engine is running (or warmed up), but a major leak once the system fully cools down.

At the recommendation of a few folks, I smeared some Hylomar on the connection and used a Gates PowerGrip SB clamp.

I have not refilled the system yet, but I am not very confident that this will resolve the issue.

This particular hose is unique - it has a lot of curvatures and is over 2 ft long. Toyota has discontinued it.

Hose ID is 11/16” and the OD (when installed onto the fitting) is about 26mm.

Any ideas are appreciated. Thank you.

 

[Trav]

I think you may be okay with that. It will interesting to see how it works.

 

[GSCJR]

What about type G style clamps (F.I. clamps)?

 

[dumkid]

sometimes you can buy normal heater hose and route it so it's not kinked. this doesn't work well in tight spaces or tight turns in the house

 

[eljefino]

Cut it off a few inches back, stuff a 3/4 to 5/8 barb fitting adapter in it, finish with 5/8 heater hose and the clamps of your choice. If what you have doesn't work.

 

[Chris142]

Put a worm clamp on it. I don't know why so many people are against them. I installed thousands in my 20 years at the radiator shop and never had a problem.

 

[redhat]

Norma makes some good worm clamps

 

[Soft Cars]

I think I'd get me a constant tension clamp like the one next to it.

 

[vavavroom]

You can make a new hose (tubing and silicone elbows). The old hose probably doesn't make good contact with the hose barb no matter how good a clamp you use.

 

[JimPghPA]

Worm clamps work IF you tighten tighten them again just a little bit more every couple of months for a while as a new hose allows the worm clamp to sink into it.


The only time I had a hose come off was about 6 months after installing a new hose and not tightening the worm clamp as the clamp sank into the hose over time. After a while it's stabilizes and you don't have to do that anymore but I would say every couple of months for the first 8 months or so you want to check it and see if you can turn it a little bit more.

 

[Vern_in_IL]

NAPA has those flexible radiator hoses.

FleetFlex Gold Flexible Coolant hose can replace a multitude of molded hose sizes and shapes on a range of trucks, buses and heavy-duty vehicles.

 

[eljefino]

NAPA has those flexible radiator hoses.

I had always wondered what those were called after seeing them on ratted out, motor swapped El Caminos.

 

[clinebarger]

I've fixed many leaky Ford hoses with Hylomar. On older vehicles with heavily pitted cast connections....Indian Head Shellac.

 

[dumkid]

as a trail repair on pitted connections permatex rtv works too. i don't know if im going to be able to get that hose off again, although it hasn't leaked yet

 

[The Critic]

Multiple heat cycles, including a 20+ mile test drive, followed by sitting inside for more than 24 hr at a time. No leaks.