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When the engine is hot the cooling system is under pressure. Carefully open filler cap on expansion tank to release pressure before starting repair work. Hoses are secured with spring-type clips. When repairing only use spring-type clips. The O-rings installed at the quick-release connections must be replaced if damaged or leaking. When installing coolant hoses, make sure that they are free of stress and do not come into contact with other components (observe markings on coolant connection and hose). Radiator Removing and installing Page 19-26 After replacing, replace coolant in complete system 2 - Securing clip 3 - Securing rubber 4 - O-ring Replace if damaged 5 - Bottom coolant hose. 17 - Bolt Tightening torque: 5 Nm 18 - Mounting rod 19 - Guard plate 20 - Bolt Tightening torque: 5 Nm 21 - Bolt Tightening torque: 5 Nm 22 - Radiator Removing and installing Page 19-26 After replacing, replace coolant in complete system. 5 - Filler cap Test with cooling system tester VAG 1274 and adapter VAG 1274/9 Test pressure 1.4…1.6 bar 6 - O-ring Replace if damaged 7 - Bolt Tightening torque: 10 Nm 8 - Expansion tank Carry out leak test of cooling system with cooling system tester VAG 1274 and adapter VAG 1274/8 9 - To rear water line Diagram of coolant hose connections.

Tags : coolant hoses, coolant hose, tightening torque, release connections, expansion tank, spring type, hose connections, audi a4, system tester, leak test, filler cap, test pressure, o ring, coolant, cooling system
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