Caution. Risk of burns from hot steam and hot coolant. When the engine is warm, the cooling system is under excess pressure. To relieve excess pressure, place a rag around the coolant expansion tank cap and carefully open it. Secure all hose connections with hose clamps of the appropriate series. The arrows on the ends of the pipes and hoses of the cooling system must be opposite each other.
(The article is a reprint of material from: «audimanual.ru»)