terminated for driving a truck with a bad leak

I was given a truck that had a bad leak from the radiator that management and mechanics knew about I had to add water from one time a day to three times a day on the 19 of December I pulled into the yard to add water because the gauge was up to 200 degrees that's when I always add water after filling it up and watching the gauge go back down i continued to rocky mt from Raleigh the truck overheated and shut down the mechanic says the engine fan quite working so it was towed back to the shop today I was told I blew the gasket because I let it overheat even though the manager saw me add water they knew this truck had a bad leak that got worse but still blame me when I could not keep water in it fast enough instaed of fixing it months ago so how is the engine fan failing my fault I have to check the water in this truck 3-4 times a day instead of them fixing it the mechanic told me he knew about it but they would not let him bring it in to fix it instead just keep driving it