when i got the la and ran it home it ran hot- so i looked in the rad. and it had a lot of rust in it-- took it out and cleaned it good and proper--put it back in -painted the thing up real nice-new tires ect.now it was time for a ride--the farther i went the hotter it got -till it steamed--felt the rad. and the only hot part was the top--i shut it off--the the water started to move on its own- restarted it and it cooled off-- took it for another spin --same thing-is the head cracked? head gasket out?the water seems to circulate until it starts to over heat! any case experts got any ideas on whats going on???