Flushing the cooling system (Peugeot 305)

1. Every 2 years, drain the coolant, flush the system thoroughly and fill it with fresh coolant. This must be done because deposits, rust and scale accumulate in the system, and if they are not removed, the engine will begin to overheat. In addition, the corrosion inhibitors present in antifreeze lose their properties over time, and antifreeze must be replaced periodically to ensure effective corrosion protection.

2. Drain coolant (see previous section) and remove the drain valve from the radiator. Cover the engine and electrical wiring with a piece of plastic so that they do not get splashed. Insert the hose into the filler neck of the radiator and flush the system with running water for 10-15 minutes.

3. Severely clogged systems may require special chemicals and backflushing. In the latter case, disconnect the lower hose from the radiator and remove the thermostat. Insert the hose into the hole under the thermostat so that the water passes through the channels of the water jacket and exits through the hole for the lower radiator hose. To backwash the radiator, it is recommended to remove it, turn it over and flush it in the opposite direction.

4. Flushing should be carried out until the outflowing water is clear. At the end of flushing, close the drain cock and reinstall all removed parts.