Grandson's girlfriends car overheated and blew the motor we seen where liquid solder was used on the radiator and I figured that leaked bad and got hot... Well we put in a used motor and new radiator(whew forgien cars are new to me) and it overheats. Anyone have a tip on bleeding the cooling system,or a possible idea why this is heating up. Do these have thermastats like V-8's. When running fluid pushes out with the cap off and cool? Thanks for any ideas!!!