[Focus Is Art]

I want to try to flush the coolant system myself, but I wonder where should I dump the coolant? It is like 8L of coolant right? What kind of container you guy use?

For my understanding this is how I should do, correct me if I am wrong.
1) take out the white plug in the driver side of the car and drain the coolant.
2) put in water and run the car for a min w/ heat on.
3) drain the water
4) put in coolant.

Thx