Pressure relief valve in cap, checking

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

Fig 1: Attaching Cooling System Tester V.A.G 1274 With Adapter V.A.G 1274/9 On Sealing Cap

Courtesy of AUDI OF AMERICA, LLC

-- Attach V.A.G 1274 A with V.A.G 1274/9 to sealing cap.

-- Generate pressure with cooling system tester hand pump.

The pressure release valve must open at 1.4 to 1.6 bar.

-- If pressure relief valve does not open as specified, replace cap.