just to say im new to scoobynet.
i brought the subaru about 3 months ago and all was fine until 1 day the radiator burst. i brought a new one and fitted it no problem, but about 4 days later i noticed water under the car and the drain plug on the new 1 looked snapped but nothing around it to snap it. i put in a new 1 and tried and tried to bleed the system it just would so i checked the thermostat, fine, new water pump still the same only thing left was head gaskets changed them and its still the same.
any ideas im really stuck. sorry about the long story lol

 

heater matrix blocked ? where are you topping it up ?

 

Are you losing water atm?

 

iv tried topping up normal and at the top radiator hose aswell some one has told me to try top up at the heater pipes. iv been told aswell to bypass the heater matrix to see if that helps. and im not losing any water that i know of

 

i think im getting somewhere now iv got all the pipes hot and my heaters are spot on. BUT when idleing it does start to overheat with water coming out of the expansion bottle and the heaters start to go cold. if i rev the engine slightly then the heaters get red hot again straight away. iv noticed abit of water coming from the neck of the header tank asif there a very very tiny hole. any ideas guys

 

Have you checked the rubber seal on the header tank cap?

 

the rubber seal is fine its asif there could be a tiny hold in the tank itself could this cause it overheat

 

I would say yes. Hole=loss of water=overheating

I think you would get a cheap replacement in the for sale section

 

fitted one that doesnt leak and still same problem. the temp gauge doesnt go up high but the fan kicks in then starts to really boil the water. iv taken out the thermostat aswell dont no what else to try.

 

ok lads i think iv done it lol. i took it out the drive put it on the road so it was level then jacked up the drivers side as high as possible which was alot lol. then filled all the pipes, heater matrix and top rad hose then let it tick over for a long time whilst pressing the top hose to get any air out. i think the main thing was to take my time. but thanks for the help guys im sure il be sticking around