Howdy been looking around and can't find an answer to my question..
basically just put a new radiator in my ke70 (bog stock 4k), not blocked or anything like that.. started her up and all fine no leaks etc.
turned car off and opened the radiator cap after being running for about 20 seconds and there was a huge amount of air which came out when the cap came off. sort of like opening a soft drink if u cud imagine.. anyway thats the first thing.. didnt think much of it so started her up again and opened the oil cap to top up oil and there was air pumping out continuiously. havnt come across this before, so bad that i cudnt top up oil with it running without wearing it.. now are these two things (build up of pressure in radiator after being running for only 20secs and air pumping from oil hole) related and what is causing it?? water pump shagged?? not too sure, help is greatly appreciated, cheers guys!