Flushing 300 Radiator

[ShawnAgne]

Is it possible to flush the 300 radiator without removing it? Have never changed the coolant in 3 years that I have had it and had to add some as it ran low and started running a little hot during winter. Thought might be good to flush it. If so just open top cap and where it drains and run a hose?

[Don McCombs]

I would use the same technique described in the Cub Operator's Manual using a radiator flush preparation or washing soda. Plain water won't do much for built-up deposits.

[tst]

that engine may have plugs in it also, pull the blocks so you can get the crap out of the block