19 y o machine, has always run perfect, but cooling issues last 6 months. Machine normally ran cool always, regardless of workload or ambient temp. Repalced radiator and thermostat. Runs cool some of the time but still acts up. Hot ambient temp can play a role but the thing that reliably seems to make the engine temp start to rise quickly is driving it on a hill. And it's not the workload of climbing the hill, it just seems to be the angle. I can watch the temp gauge steadily rise if I stay on the hill instead of going back to level ground and it would go right up to redline if I let it.
Thoughts?
Thoughts?