A battery filler bulb (also called a turkey baster) works fine. Do not use one that was used for brake fluid or battery acid. Open radiator cap, and knock you self out taking 3oz at a time.
Genuine Subaru Long Life Coolant P/N SOA868V9210.....
"Flushing" a radiator is recommended when the coolant has passed its recommended service life or has been mixed with other fluids. Most manufacturers have outlined in the owners manual when it should done as maintenance.
Radiator coolant.
Coolant goes in the radiator or you can also fill the radiator resevoir.
Low coolant, radiator restriction.Low coolant, radiator restriction.
In systems that do not have a radiator cap, the coolant is drained by the radiator drain plug. It is filled by adding coolant to the system through the overflow bottle.
A 50/50 mixture of water and coolant/antifreeze is highly recommended to avoid freezing and/or rusting within the radiator.
Silicon
If the radiator is cracked then the vehicle has ran dry on coolant. This would cause the radiator to crack if there wasn't any coolant.
You add coolant to a C240 at the radiator overflow tank. This allows the radiator to suck in coolant as needed when hot.
One flushes a radiator by draining the radiator, rincing the radiator, and then by adding a new coolant. One should remember that the drained coolant is toxic.
Coolant for Suzuki scrum radiator costs approximately $107.50.