Checking pressure relief valve in cap

Fig 1: Checking Pressure Relief Valve In Cap

Courtesy of VOLKSWAGEN UNITED STATES, INC.

• Place cooling system tester V.A.G 1274 with adapter V.A.G 1274/8 onto cap.
• Generate a positive pressure using hand pump of cooling system tester.

• Pressure release valve must open at a positive pressure of 1.4 to 1.6 bar.

If pressure relief valve does not open as indicated:

• Replace cap.