My Kubota 2660 runs hot, right at the red line. I was going to flush the radiator, but can't find the drain plug. Nor can I actually get to the radiator because it's encased with the body and frame. I noticed that the battery is setting right in front of the radiator. Does the battery prevent the fan from working properly? It looks as if only about 20% of the radiator actually gets air. It has run hot since I bought it used earlier this summer, but now it is very hot. Thoughts?