Pressure Relief Valve in Cap, Checking

Fig 1: Identifying VAG1274B & VAG1274/9

Courtesy of AUDI OF AMERICA, LLC

-- 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.