Cooling system, checking for leaks: Notes

WARNING: This page is about a different car, the 2006 Audi A4, 2005 Audi A4, 2004 Audi A4, 2003 Audi A4, and 2002 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Special Tools - Cooling System, Checking For Leaks

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Special tools and equipment

VAG1274 Cooling system tester
VAG1274/8 Adapter
VAG1274/9 Adapter

Requirement

Engine at operating temperature.

Work sequence

WARNING:

Cover cap of expansion tank with rag and open carefully, as hot steam i.e. hot coolant may escape when opening.

Open cap of coolant expansion tank.

Fig 2: Attaching VAG1274 Cooling System Tester Together With VAG1274/8 Adapter To Coolant Expansion Tank

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Attach VAG1274 cooling system tester together with VAG1274/8 adapter to coolant expansion tank.
Use tester hand pump to create a pressure of approx. 1.0 bar.
If pressure drops, detect leak and repair malfunction.