Could be a blown head gasket or cracked head, fit a pressure gauge to the radiator and start engine , as sharp rise in pressure indicates the above faults.
A few things to check before we condemn it as a leaking head gasket(pressurising water out).
First check the radiator cap seal,no cracks and that it takes some pressure to push the spring loaded part down.
Does both the top and lower radiator hose get hot as temp gets to normal(where thermostat should be open).if not,the thermostat may be a faulty one or has slipped out of seat as the cover was bolted back down onto it.(temperature will differ either side of it).I have had some of these come in with part of the waterpump impellor rotted away.same symptom of one hot and one cold hose,and water doesnt flow inside radiator with cap off(ensure this is not removed if engine is hot)and temp where the thermo should be open.
Possibly the radiator needs sending out for the top or side tank to be removed and each tube cleaned out.this is a lot more effective than trying to reverse flush with water only.
But if temp is normal these areas should be fine.
Do the hoses swell with pressure and become hard to squeeze in a short time?this could reveal a leaking head gasket and should be tested with a teekay type tester for the presence of cylinder gases in cooling system.
Do the fan(s) come on if sitting idling at normal temp for 5-10mins?water can be pushed out if they dont come on or their cut in/out temp is incorrect.hope this helps.
let me know some times re when it pushes water out,do you hear a boiling sound from inside engine or radiator when this happens,any other info that may help diagnose.
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