If your vehicle’s owner’s manual has instructions for draining the liquid from the cooling system, follow them. If you don’t have a manual, or if it lacks such instructions for flushing the cooling system, follow these steps to flush and change the coolant without endangering the environment.
A funnel and some old gallon water jugs do the job as long as you label them prominently and pour carefully to avoid spilling the liquid on the ground.
Keep an eye on the temperature gauge to make sure that the engine doesn’t overheat. If your vehicle has an engine temperature warning light instead of a gauge, shut off the engine as soon as it lights up.
The liquid should reach the “MAX” line on the coolant recovery reservoir or cover the fins in the radiator. If it doesn’t, continue to add equal parts water and coolant until it does.