Hot steam can escape from the expansion tank when the filler cap is opened. Cover the filler cap with a cloth and unscrew it carefully. Note: 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. VAG 1921 pliers are recommended when installing 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). Perform leak test on cooling system with cooling system tester VAG 1274 and adapter VAG 1274/8.
Cooling system components (on body), removing and installing
Note: Parts of cooling system on engine 19-8 . Diagram of coolant hose connections Page 19-17 . Draining and filling with coolant Page 19- 19 . Coolant mixture ratios Page 19-19 , draining and filling cooling system.
1 – 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 Secured to radiator with retaining clip Check for secure seating Diagram of coolant hose connections Page 19-17 7 – Retaining bolt 8 – Nut Tightening torque: 10 Nm 9 – Fan ring Clipped into air ducting and secured with retaining bolt -Item 7 – 10 – 2-pin connector 11 – Radiator fan (-V7-) 12 – Connector Black, 3-pin For radiator fan thermoswitch.

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Related Tags: air ducting, audi a4, coolant, coolant hose, coolant hoses, cooling system, expansion tank, fan ring, filler cap, hose connections, leak test, o ring, pin connector, radiator fan, release connections, retaining clip, spring type, system components, system tester, tightening torque