1994 Mitsubishi Pajero

Engine Cooling problem
1994 Mitsubishi Pajero 4 cyl Four Wheel Drive Automatic

hi, my 4x4 recently overheated but rather than stop I kept going but not very far, my engine cut out and I was towed home by recovery.

now upon inspection I found that my radiator had a large crack in it so I bought a new one. I drained everything out the old radiator and reserve tank flushed it and installed the new radiator, top it up with 50/50 coolant and water.

i left of the radiator cap to "burp" the air out but everytime I turn the engine over it turns but will not start and huge amounts of pressure and water comes out my radiator.

any ideas

thanks