radiator/ thermostat/ hose question

Hey all...
When I bought my 02 it had recently had the radiator replaced.
I noticed it had the green coolant so I decided to flush all that out and replace it with the red coolant.
The upper radiator hose has always felt like it was about to burst.
In fact I have had to change it once because it started leaking from a hole towards the center of it.
To the best of my knowledge they did not replace the thermostat when they swapped out the radiator.
Could that be a reason for the high pressure?
I'm hearing different things from friends that Toyota upper hoses are always pretty swollen but I've never run the question by you guys.
As always, your input is appreciated!

 

Can you post pics of the hose? Does no issues with temp at all?. I am not sure the jiggle valve being stuck out would make that particular hose bulge out like that. For my own piece of mind, I would go in and replace the thermostat with an Aisin or OEM, make sure the jiggle valve is positioned at the 6’o clock position. Not a difficult job and should be done at regular intervals when replacing the timing belt. I am curious to see where the bulging is.

-Karl

 

Thank you for that. I am probably going to swap the thermostat soon. It's not bulging in any particular place. It's just crazy pressurized (not squeezable at all) until the thermostat finally opens and even after it's still pretty hard.

 

Radiator caps are available in different pressure (PSI) ratings for different vehicles. Since your radiator is replaced its neck that accepts the radiator cap may be same or different as a Toyota cap. If it takes a stock cap it could still have an internal shape that puts too much preload on the cap spring. Your actual cap could be built for a higher pressure or perhaps it is defective and has a different higher pressure which would definately stretch a hose.
I have read there are test devices that measure radiator cap release pressure. Shops doing radiator repair should have one.
I will try to find the stock 4runner cap pressure, does anyone know?

 

Wowzers!
Thank you !

 

88kpa I want to say?

 

93 or 94 KPa

Take the release pressure, normally about 13.5 PSI, and multiply by about 6.895.
Hope this is some help...
Pat☺

 

Thank you

 

I just happen to have a pic of the radiator cap off my 2000 Limited…108kPa (~15.7 psi)

 

Thank you much !!!