Flushing the cooling system (Peugeot 305)

1. Every 2 years, drain the coolant, thoroughly flush the system and fill it with fresh coolant. This needs to be done because deposits, rust and scale build up 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 to ensure effective corrosion protection, antifreeze should be replaced periodically.

2. Drain the coolant (see previous section) and remove the drain cock from the radiator. Cover the engine and electrical wiring with a piece of plastic to prevent splashes from getting on them. Insert the hose into the radiator filler neck and flush the system with running water for 10-15 minutes.

3. If the system is heavily clogged, special chemicals and backwashing may be required. In the latter case, you should 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 comes out through the hole under the lower radiator hose. To backwash the radiator, it is recommended to remove it, turn it over and backwash it.

4. Rinsing should be carried out until the flowing water becomes clear. After finishing flushing, close the drain valve and replace all removed parts.

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