Checking The Pressure Relief Valve In The Version 2 Cap:

Courtesy of AUDI OF AMERICA, LLC

-- Position the :VAG1274B  with the :VAG1274/9  on the cap.

Courtesy of AUDI OF AMERICA, LLC

-- Generate pressure with the cooling system tester hand pump.

Blue Cap: 

• The pressure release valve must open at 1.4 to 1.6 bar (20.30 to 23.20 psi).

-- If the pressure relief valve does not react as specified, replace the 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.