2003 Subaru Forester Owner's Manual - Page 315

In case of emergency Engine overheating Never attempt to remove the radiator cap until the engine has been shut off and has fully cooled down. When the engine is hot, the coolant is under pressure. Removing the cap while the engine is still hot could release a spray of boiling hot coolant, which could burn you very seriously. If the engine overheats, safely pull off the road and stop the vehicle in a safe place. Confirm that the cooling fan is turning. If the fan is not turning, immediately turn the engine off and contact your authorized dealer for repair. 3. After the engine coolant temperature has dropped, turn off the engine. If the temperature gauge stays at the overheated zone, turn the engine off. 4. After the engine has fully cooled down, check the coolant level in the reserve tank. If the coolant level is below the "LOW" mark, add coolant up to the "FULL" mark. 5. If there is no coolant in the reserve tank, add coolant to the reserve tank. Then remove the radiator cap and fill the radiator with coolant. If you remove the radiator cap from a hot radiator, first wrap a thick cloth around the radiator cap, then turn the cap counterclockwise slowly without pressing down until it stops. Release the pressure from the radiator. After the pressure has been fully released, remove the cap by pressing down and turning it. ! If steam is coming from the engine compartment Turn the engine off and get everyone away from the vehicle until it cools down. ! If no steam is coming from the engine compartment 1. Keep the engine running at idling speed. 2. Open the hood to ventilate the engine compartment. 9-12