fdmars,
I hear you about the dust build up. I owned a 2305 for about 13 years and the front grill frequently plugged up with debris, especially if mowing in dusty conditions. The best "solution" I ever found was to periodically turn off the tractor and wipe down the front grill with my gloves. If the tractor is set to idle, it still has a considerable amount of suction making grill cleaning difficult at best. Though I never did it, If you can figure out how to get a temp gauge on the dash, I would highly recommend that option.
Best wishes,
SI2305 (Old handle, new tractor)
2018 JD2023r, loader, 6'rotary cutter