I have a John Deere 1020 utility. I bought this tractor last year and recently noticed after running it to move snow that the antifreeze comes out the overflow. The tractor has never overheated according to the temp gauge, I have also felt the block and the head after using and it as well did not feel hot, I have replaced the radiator cap, the radiator neck appears to be fine. It appears the previous owner had installed a new water pump. The tractor starts right up and runs great, no sign of antifreeze in the oil. Any ideas?