1. Turn the car key of Peugeot 307 to the off position and turn off the engine.
2. Let the engine of Peugeot 307 stand until the water temperature drops to normal temperature.
3. Pull the front hood opening wrench of Peugeot 307.
4. Lift the front hood of Peugeot 307 for stable support.
5. Slowly unscrew the small lid of Peugeot 307 water tank to release the internal pressure.
6. Add water to the highest water level of the water tank kettle.