Pressure Relief Valve In Cap, Checking

WARNING: This page is about a different car, the 2012 Volkswagen Touareg and 2011 Volkswagen Touareg. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Checking Pressure Relief Valve In Coolant Reservoir Cap

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Position the Cooling System Tester:VAG1274B with the Cooling System Tester - Adapter:VAG1274/8 on the 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 open as specified, replace cap.