if the engine stopped due to overheat then the head gasket would be broken, but as you mentioned naagapan naman, so meaning nag increase lang temp and the engine was still running. to tell whether the head gasket is busted is to run the engine cold and open the raidator cap fill it with water if lacking and observe if the water is being ejected from the radiator opening. yes tama ka tatagas ang water pump if broken na. If I were you drain all water/coolant first, change the rubber hoses all of them, refill with new water/coolant combination and observe.