I only have this problem in the high country,the buck brush has so much pollen/dust and leaves it clog's the radiator so tight you can't clean it with a submersible pump. I've tried a wire brush, tooth brush. the only way I've found to get it clean is a pressure wash when I get home.
Anyone have a cure for this problem,I haven't figured out how to stop this while I'm hunting. I think it only happens with the 800 cc motors