if its getting that hot that quick, the problem is more than a leack, remove the small pipe that feed into the coolant resovor, fill coolant resovor, start engine an rev. there shoudl be a good flow of coolant out of said pipe. if not remomove the waterpump and check to see if the inpeller is still on the end of the shaft and has it's blades still intact. it probobly dosent. you will also need to fit a new thermostat they don't like being cooked and tend to lock open