Open The Coolant Reservoir Cap

WARNING: This page is about a different car, the 2010 Audi A5, 2009 Audi A5, and 2008 Audi A5. However, it is still accessible from the selected car via links, so may be relevant.

-- Position the Cooling System Tester:VAG1274B with the Cooling System Tester - Adapter:VAG1274/8 on the coolant reservoir.

Fig 1: Connecting VAG 1274 B & VAG 1274/8 To Coolant Reservoir

Courtesy of AUDI OF AMERICA, LLC

-- Generate approximately 1 bar pressure using the cooling system tester hand pump.

-- If pressure falls, search for leaks and correct problem.