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.

[Dr. Roger]

when the cooling system cools, vacuum sucks water from the bottom of the purge tank, back into the system.
that said, check your purge tank and make sure the rubber hose that goes to the rad cap thingy picks up water from the bottom of the purge tank.
also make sure the little (usually brass) return pressure spring in the center of the radiator cap is free and working properly.