Pressure Relief Valve in Cap, Checking
WARNING: This page is about a different car, the 2018 Audi TT Quattro. However, it is still accessible from the selected car via links, so may be relevant.
-- Position the :VAG1274B with the :VAG1274/9 on the cap.
-- Generate approximately 2 bar (29 psi) pressure using the cooling system tester hand pump.
Blue Cap:
- The pressure must lower to 1.4 to 1.6 bar (20.30 to 23.20 psi) and stay there.
Black Cap:
- The pressure must lower to 1.6 to 1.8 bar (23.2 to 26.1 psi) and stay there.
All Caps:
-- If the pressure relief valve does not react as specified, replace the cap.