Why does my radiator hose come off when starting it.?

i just changed my radiator and put a brand new one in. but when i finished putting it back on. and put water in it . and tried to start it it just rived and then the main hose on top blew off. put it back on and tightened it and then the big hose on the bottom blew off. why is this happening. also the car did not start. it is a toyota camry 1992 thanks|||Have the car%26#039;s cooling system pressure tested. Sounds like a bad head gasket or cracked head.|||hose clamp not tight enough or replace with new one..... cheap fix|||sounds like the new radiator is blocked up take it back for exchange|||Hi sounds like you are building up pressure in the system this could be


a blown head gasket. Or it could be the garage did not take out


the plastic bungs out of the radiator.But with you saying it would


not start it sounds more like the gasket. I would take it back to


the garage that fitted the Rad.|||Sounds like there%26#039;s a blockage somewhere. Most cars pump the hot engine coolant into the bottom of the radiator, and the cooled water comes out the top and goes back into the engine. If it was always the lower hose that popped, then I%26#039;d say the radiator, but with both popping ........ Try this - Run the engine with the radiator cap off. If the system is flowing correctly, the coolant should NOT come out the open cap. If it does, then you%26#039;ve got a problem to find...