advice flushing cooling system

[arch007]

my engine is fresh water cooled.


It is not overheating but I dont know when the PO serviced the cooling system.


my question is should i drain the coolant and use something to clean the system then refill with new coolant ?


If so do I have to worry about air locks in the coolant system ?


Or any other possible problems ?


thanks,


arch

[Attikos]

I do mine just as I do my car's, with flushing and descaling. There should be bleeder valves here and there to let out any trapped air once you're done.