Cooling System, Checking For Leaks

Cooling System, Checking for Leaks

Special tools, testers and auxiliary items required

• Cooling system tester (VAG 1274)

• Adapter (VAG 1274/8)

• Adapter (VAG 1274/9)

Test Sequence

• Engine at operating temperature.

CAUTION!
Hot steam may escape when opening the expansion tank cap. Wear protective goggles and protective clothing to prevent damage to your eyes and from scalding. Cover the cap with a cloth and open the cap very carefully.

- Remove the coolant expansion tank cap.

- Install the (VAG 1274) with the (VAG 1274/8) onto the expansion tank.





- Generate a positive pressure of approximately 1.0 bar using the (VAG 1274).

If the pressure drops:

- Search for leaking areas and repair the malfunction.

Pressure Relief Valve in Cap, Checking





- Install the (VAG 1274) with the (VAG 1274/9) to the expansion tank cap.

- Operate the (VAG 1274).

• The pressure release valve must open at 1.4 to 1.6 bar.