Dear All i have a old lorry of 2000 Model of TATA make.I found the water boiling from the radiator when used for transporting goods. I changed the radiator with a new one as advised by my mechanic.Still my vehicle seems in same condition.What could be the reason for water boiling.
Bad water pump, take it off and check impeller.Fan belt loose or missing. Blown head gasket, if radiator water is scummy and frothy. Or bad thermostat, as previously said.