Subaru EJ25 Renegade Hybrids Radiator Problems, i need help or advice from people who have done this conversion Options

[budman5201]

Hi. I recently converted my 914 to Ej25 power, and love it but i am having issues with air bubbles in the radiator and it wont cool very well.

Can someone please give me a diagram or maybe just tell me their hose routing and radiator cap pressure and tell me if the bubbles ever go away.

Symtoms while driving....I gun it and then close the throttle and coast and i get water coming out of the radiator reserve tank ( i have it routed in a tube so it doesnt splash around) and i see a stream on the road when i do this. Then when i get home i can bleed the top air bleeder screw on the top of the renegade radiator and a ton of air comes out, then i go to the back and i can fill the fill cap with another pint of water. This NEVER stops. Always needs water and their are no leaks apparent other than this squirting symtom.

My radiator cap is a 16 lb cap. The routing goes from thermostat through the engine block up , out the mainfold on top to the highly mounted aluminum housing that i bought from Renegade that i fill the water from( this has the radiator cap part), then down underneath the car to the radiator up front then back to directly into the thermostat/ water pump again. I drilled the thermostat also like instructed with 3 small 1/8 inch holes in diaphram.

I am lost why it still needs water all the time. I know why it does because of the spurting, but dont know why it does this....arrggH!!

Any help is appreciated. thankyou very much.

[pffft]

When you say the "top air bleeder on the radiator" do you mean the top petcock?
If so, that is not an air bleeder, if you open that and anything but water comes out
you don't have a full system. (at least if it is the same as on my v8 renegade radiator).
My method is to park with the back higher, open the top petcock in the radiator and
start filling through the radiator cap. When water starts to come out of the top petcock, close it and keep adding water. When it won't take any more, wait a bit
and you will usually see a few bubbles and the level will drop. Add water. Squeeze
any hoses you can and this usually moves a bit of air. Let it sit, and do it some more. At this point I fire it up and let it idle and add water as the air bubbles come
out. Mine won't overheat at this point, but sometimes the fans come on. Keep at
it until you get bored, and drive it. MAKE SURE your overflow bottle has water in it,
cause as stated above, it will suck water to replace the air as it heat cycles after
shut down. A few drives like this and you will have the air out and should be fine.
(obviously just personal experience, no expert)

patrick

[pffft]

By the way, I've got a turbo baja and I thought that motor would be the very
best conversion possible for a 914.

patrick

[budman5201]

I think i have an idea of what it could be.

I have the aluminum bottle like yours mounted in the exact same location as yours in the pic, but my subaru shoots the water from the bottom directly at the cap, so this i think is the problem. At a good throttle pressure is hitting the cap making it unstick and shoot water to the expansion tank when the pressure isnt even built up, then i have less coolant and then the boiling point isnt as high due to the fact that now i have less coolant.

I am changing the system to go directly to and fron the radiator without any bleeder there....instead i am running a wrx expansion tank and running the heater core lines in the back of the subie motor which are smaller 1/2 inch lines in and out of the expansion tank, and that will be my new expanstion location. this way the actual flow of the water will not be pressing directly at the cap and the only thing that will be making it surge up and loose coolant through the expansion tank will be pure coolant pressure itself and not current of the water during hard acceleration......hopefully this is my problem ...seems logical, a new tank and we will see.....
thanks so far...hopefully this weekend it works!!

By the way, I've got a turbo baja and I thought that motor would be the very
best conversion possible for a 914.

patrick