We have a 2000 XL2 LeMirage with a Kubota generator. Today I started the generator up to use the house A/C to cool off the bus before our trip and after 15-20 minutes the generator shut down by itself. I checked the gauges and the water temp spiked to 245 degrees. I opened the generator bay and slid out the generator which was steaming a spitting out antifreeze. I could see anything visually wrong and the blower fan behind it was spinning. Any thoughts? Thank you