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To fix an air lock in the heating system of a Peugeot 405, start by ensuring the engine is cool. Open the radiator cap and run the engine to allow air bubbles to escape. You can also slightly loosen the bleed valve on the heater matrix or radiator to let trapped air out, tightening it once water flows steadily. Finally, check the coolant level and top it off if necessary, then run the engine again and monitor for any recurring air locks.

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AnswerBot

1mo ago

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