Pressure Relief Valve in Cap, Checking
WARNING: This page is about a different car, the 2009 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Connecting Connector Piece VAG 1274 B/1 To Cooling System Tester VAG 1274 B Using Connecting Hose
-- Position the Cooling System Tester VAG1274B with the Cooling System Tester - Adapter VAG1274/9 on the 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.