John Deere

paid 10, ooo cash for new x740 garden tractor, first use engine overheated, had service dept.work on it three times, did not fix problem, still having same problem, only has 71 hrs on it, and they put 22 of those on it, have to add coolant every use, salesman said not to worry, he would order a different one, week later manager told me, not going to happen, that why they have a service dept, and warranty.then why can't they fix it, he still has no answer, was there 10/7/2010, still no help!douglas pike