As the previous comments have mentioned. Probably a blown head gasket and possible a warped head. Both are repairable.
To be honest it sound like you blew a head gasket or cracked/ warped head when they over heat this happens most of the time it leave a spot for air to blow in to the cooling system caused by the compression from the piston and when air is forced in it blows water out of the radiator the water pump will not couse. This if it was water pump the coolant just won't circulat hope this helps
Possibly blew a head gasket allowing combustion gases to enter the cooling system and force coolant out of the overflow tank. This can be verified by doing a compression check on each cylinder.
SOURCE: 99 cadillac deville engine overheating an loosing
Check to see if you have flow through the entire radiator.If part of the radiator core is cool to the touch when the engine is at operating temp, this indicates restricted radiator flow. If the entire radiator core is not allowing water to flow through, cooling will not be at all efficient. Also a good idea would be to purchase a block tester. available at napa and other reputable parts houses for around thirty dollars. You remove a small amount of coolant, and put the tool in the radiator, or pressure tank opening. If there are any combustable gasses present, i'e' exhaust, this would indicate a head gasket breech, (or maybe worse) and would indicate that it's time to stop looking for a simple problems, and get proffessional help. Good luck to you!
SOURCE: My Pajero 2800 Turbo Diesel blows water into overflow tank
Have a look at the thermostat.
If it's blocked shut, there won't be the circulation through the rad.
You may need to invest in some 'radweld' type treatment too.
Good luck with that.
Don't forget to rate, thanks ;)
SOURCE: 2002 ford taurus. Radiator overflows but, temp gauge not hot.
It could be both your thermostat and water pump, it could also be an air lock in your cooling system. One way or another, I think pressure is building up in part of the system because its not circulating properly.
When its cool, take the top off your reservoir, give the bottom hose to your radiator a good few squeezes, see if the water goes down a little, if it does, you moved something on and probably cured it.
If not, run the engine up, to get it warm and bleed off any air in the system. (Assuming there are bleed taps in the system)
If that also does nothing, I reckon its your water pump. And if your changing that, I'd suggest changing the thermostat at the same time.
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