Just purchased a 2440. Everything looked good, no leaks, smoke or serious obvious problems except for broken differential lock pedal which I would like to address later. Brought it home and drove it around for a few minutes. Decided to brush hog a small area and it worked fine for a little over an hour. Then water boiled out the radiator fill. Shut down to idle and moved short distance to check further. Got the radiator cap off and slowly poured in about a gallon of water. No more steam, so I shut it down. After about an hour, started it back up and it boiled over in a few minutes at idle. Added a little more water and let it idle a few more minutes then shut it down for further checks. Removed top hose to check thermostat and there was not one installed. Next day checked water pump by removing small bypass hose and started tractor. Water forcefully shot out small hose. Removed radiator and discovered significant area with damaged fins and tubes, about the size of my hand. Doubtful water could have flowed through the tubes or air through the fins. Surprised it did not leak, perhaps someone had added stop-leak. My son is pulling water pump today to inspect impeller. Is there a way to make sure coolant can flow through the entire block and head before we go any further? Thanks in advance for your help.