Pressure Relief Valve in Cap, Checking
WARNING: This page is about a different car, the 2018 Audi S6, 2017 Audi S6, and 2016 Audi S6. However, it is still accessible from the selected car via links, so may be relevant.
Cap, Version 1:
-- Position the :VAG1274B with the :VAG1274/9 on the cap.
Blue Cap
-- Generate pressure with cooling system tester hand pump.
- The pressure release valve must open at 1.4 to 1.6 bar (20.30 to 23.20 psi).
-- If pressure relief valve does not react as specified, replace cap.
Black Cap
- The pressure release valve must open at 1.6 to 1.8 bar (23.2 to 26.1 psi).
-- If the pressure relief valve does not react as specified, replace the cap.
Cap, Version 2:
-- Position the :VAG1274B with the Adapter:VAG1274B/15 on the cap.
-- Generate approximately 2 bar pressure using the cooling system tester hand pump.
Blue Cap
- The pressure must lower to 1.6 to 1.4 bar and stay there.
-- If the pressure relief valve does not react as specified, replace the cap.
Black Cap
- The pressure must lower to 1.8 to 1.6 bar (26.1 psi to 23.2) and stay there.
-- If the pressure relief valve does not react as specified, replace the cap.