Cooling System Draining
1) Remove degassing tank cap (1) by turning it counterclockwise slowly in order to release any pressure.
2) Drain coolant from radiator drain plug (2).
3) Check drained coolant for contaminants such as rust, corrosion or discoloration.
If coolant is contaminated any one or coolant replacement is necessary, flush cooling system referring to Cooling System Flush:K9K .