Subaru 2003 Legacy - Manual (Page 388)

11-16
HG0115
Rubber gaskets
3. After refilling the reserve tank and the radiator, reinstall the caps
and check that the rubber gaskets inside the radiator cap are in the
proper position.
B
Changing the coolant
WARNING
Never attempt to remove the radiator cap until the engine has
been shut off and has cooled down completely. Since the coolant
is under pressure, you may suffer serious burns from a spray of
boiling hot coolant when the cap is removed.
Change the engine coolant using the following procedures according
to the maintenance schedule in the “Warranty and Maintenance Book-
let”.
1. Remove the under cover.
2. Place a proper container under the drain plug and loosen the drain
plug.