Checking cooling system for leaks (Polo, Touran, Golf Plus, Eos, Scirocco, Golf, Golf Cabriolet)

Special tools and workshop equipment required

• Cooling system tester - V.A.G 1274 B-
• Adapter for cooling system tester - V.A.G 1274/8-
• Adapter for cooling system tester - V.A.G 1274/9-

Prerequisites for check

• Engine at operating temperature.

Test sequence

• Open cap on coolant expansion tank.
• Screw adapter for cooling system tester - V.A.G 1274/8- onto expansion tank.
• Clamp connector - V.A.G 1274 B/1- into adapter for cooling system tester - V.A.G 1274/8-.
• Join connection piece - V.A.G 1274 B/1- to cooling system tester - V.A.G 1274 B- using connecting hose supplied.

• Use hand pump on tester to create a pressure of about 1.0 bar.

If the pressure drops:

• Find leaks and rectify.

Check pressure relief valve in cap.

• Screw cap into adapter for cooling system tester - V.A.G 1274/9-.
• Clamp connector - V.A.G 1274 B/1- into adapter for cooling system tester - V.A.G 1274/9-.
• Join connection piece - V.A.G 1274 B/1- to cooling system tester - V.A.G 1274 B- using connecting hose supplied.
• Use hand pump on cooling system tester to create a pressure of max. 1.4 bar.

The pressure relief valve must still remain closed.

If the pressure relief valve opens prematurely:

• Renew sealing cap.
• Increase pressure to over 1.4 bar.

The pressure relief valve must open.

If the pressure relief valve does not open:

• Renew sealing cap.