Audi Workshop Service and Repair Manuals

Checking cooling system for leaks Special tools and workshop equipment required

t  Cooling system tester -V.A.G 1274 B-

t  Adapter for cooling system tester -V.A.G 1274/8-

t  Adapter for cooling system tester -V.A.G 1274/9- Test condition l  Engine must be warm.

Test sequence   WARNING Hot steam or hot coolant can escape when expansion tank is opened; cover filler cap with cloth and open carefully. –  Open filler cap on coolant expansion tank.

–  Attach cooling system tester -V.A.G 1274- with adapter for cooling system tester -V.A.G 1274/8- to expansion tank. –  Use hand pump on cooling system tester to create a pressure of approx. 1.0 bar. If the pressure drops: –  Trace leak and repair.

Checking pressure relief valve in filler cap –  Attach cooling system tester -V.A.G 1274- with adapter for cooling system tester -V.A.G 1274/9- to filler cap. –  Use hand pump on cooling system tester to create pressure. l  The pressure relief valve should open at a pressure of 1.4 ... 1.6 bar. If the pressure relief valve does not open as described: –  Renew filler cap.