Cooling system, checking for leaks: Notes

WARNING: This page is about a different car, the 2010 Audi A8, 2009 Audi A8, 2008 Audi A8, and 2007 Audi A8. However, it is still accessible from the selected car via links, so may be relevant.

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Special tools, testers and auxiliary items required

Cooling system tester V.A.G 1274
Adapter V.A.G 1274/8
Adapter V.A.G 1274/9

Work procedure

Engine at operating temperature.

CAUTION: Risk of scalding due to hot steam and hot coolant.

When the engine is warm the cooling system is under pressure.
To reduce pressure, cover coolant reservoir cap with cloth and carefully open.

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Position Cooling System Tester V.A.G 1274 with adapter V.A.G 1274/8 on expansion tank.
Generate a positive pressure of approx. 1.0 bar using hand pump of cooling system tester.

If pressure drops:

Look for leaking places and fix them.