Cooling system, checking for leaks: Requirement

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

Engine warm.

CAUTION: Hot steam can escape when cap on expansion tank is opened. Cover cap with cloth and open carefully.

Open cap on coolant expansion tank.

Fig 1: Installing Tester VAG1274 With Adapter VAG1274/8 Onto Expansion Tank

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Install tester VAG1274 with adapter VAG1274/8 onto expansion tank.
Use tester hand pump to generate pressure of approx. 1.0 bar.
If there is a drop in pressure, locate leak and eliminate fault.