We have a 2017 Cub Cadet Challenger 700 and after about 250hrs - started overheating - runs great - but is definitely overheating and dumping coolant into the overflow tank. I replaced both temp sensors - and when I let the engine idle for a while with the radiator cap off - I can see when the fan kicks on and watch the water level drop, which I assume is when the water pump kicks on. could the air bleed remedy this as well?