Checking Pressure Relief Valve

Fig 1: Checking Pressure Relief Valve In Coolant Reservoir Cap

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Position the Cooling System Tester: V. A. G 1274 B  with the Cooling System Tester - Adapter: VAG1274/9  on the cap.

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

• The pressure release valve must open at 1.6 to 1.8 bar (23.21 to 26.11 psi).

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