Ok having issues with my coolant system. This has been happening for a while now. Ill take my rad cap off and look down in my radiator and its only about half full, so ill fill it up to the top and let it run to burp out any air in the system. The next time i drive my car the antifreeze will spew out of the top of the recovery tank. The cap on the recovery tank is vented, im assuming thats how its supposed to be. Im never able to keep my system full of antifreeze, every single time i fill it completely up, it spews out the recovery cap and it sits about half way full in the radiator. Anyone have any issues like this before? I filled it up again yesterday or so...and today when i got home from work i heard hissing and found that my radiator had blown a crack down the side of it. I figure theyre related, but whats the deal here. Any input would be appreciated, maybe i have some stoppage and need to flush it. I plan on flushing it when i put a new radiator in soon though. Thanks in advance guys.