How did you know it was cracked????
I hope mine is ok, as i think it's maybe using some water (although the radiator is leaking) I couldn't help notice a more than usual quantity of water coming out the exhaust, hope it's just my imagination..
So how long would it have to be run to expand that much and crack?????
get your rad fixed asap m8
if the rad drops its guts an spits it all out..when your driving the car ..
you know what happens