very good question, something I did not think about....
I have not drained it, however it does have decent coolant leak. I keep it full but I bought it knowing this. It also had this cranking problem as well. I am not sure if the PO filled it correctly or not. Its a freeze plug int he back of the motor so I am waiting til I pull the trans do to the doubler and do everything at once. it should happen soon.
is there a vent plug or something I need to pull when filling?