Bring it to a recycling center
by recycling it :)
The best way to dispose of a cartridge is to recycle it, if you are not able to get a refill for it. You will take it to any recycling facility to dispose of it.
The only way to drain all the coolant is to unhook the bottom radiator hose. The radiator does NOT have a drain vale.
The coolant enters the engine by way of the lower radiator hose and exits the engine by way of the upper radiator hose.
Coolant always goes in the top of the radiator.
Easiest way to drain the radiator is to remove the lower coolant hose.
pour it over a fire
As coolant cycles through the engine, it absorbs heat from the engine, after which, it continues through the cooling system back to the radiator. As the coolant passes through the radiator, the heat is exchanged to the ambient air by way of airflow through the radiator fins (this is why it's important not to bend the radiator fins).
Atoz radiator doesn't have a drain plug. The only way to drain the coolant by removing its bottom radiator hose
The coolant leaves the radiator by way of the lower radiator hose then enters the water pump in most automotive engines.
Drain the radiator, and dispose of the fluids as it is toxic to animals. Remove the water pump belt. Take off the fan and fan shroud if they are in the way. Unbolt the pump, remove it, then install the new pump. Replace the belt, fan and shroud, then refill the radiator with new coolant.
The proper way to dispose of latex paint is to let it dry out completely, then throw it away in the regular trash. You can also take it to a household hazardous waste collection site for proper disposal. Do not pour it down the drain or into the environment.