Sonata GLS V6-2.5L (2000)
Coolant: Service and Repair
1. Set the temperature control lever to the hot position.
2. Remove the radiator cap.
CAUTION: Remove cap slowly as the system is pressurized and the coolant may be hot.
Do not open the cap when engine is hot.
3. Loosen the drain plug to drain the coolant.
4. Drain the coolant from the reserve tank.
5. After draining the coolant, tighten the drain plug securely.
6. Supply the coolant into the radiator until it is filled up to its filler neck.
7. Supply the coolant into the reserve tank.
8. After warming the engine until the thermostat opens, remove the radiator cap and check the coolant level.
9. Supply the coolant into the radiator until it is filled up to its filler neck, and install the radiator cap securely.
10. Fill the reserve tank with coolant up to the "FULL line.