1. Open the bonnet.
2. Locate the plastic coolant reservoir. It is usually located on the left-hand side of the engine bay, near the top.
3. The cap of the coolant reservoir should have a symbol indicating coolant or fluid.
To add coolant to a Peugeot 307:
1. Ensure that the engine is cool and switched off.
2. Remove the cap of the coolant reservoir.
3. Add a 50/50 mixture of antifreeze and water to the reservoir until the level reaches the "MAX" mark.
4. Replace the cap of the coolant reservoir.
