Cooling System: Testing and Inspection

Cooling System, Checking Seal

Special tools, testers and auxiliary items required

• Cooling System Tester (VAG1274)

• Adapter (VAG1274/8)

• Adapter (VAG1274/9)

Work procedure





• Engine at operating temperature

CAUTION!
Cover cap of coolant expansion tank with rag and open carefully, as hot steam or hot coolant may escape when opening.

- Open cap of coolant expansion tank.

- Position Cooling System Tester (VAG1274) with Adapter (VAG1274/8) on coolant expansion tank.

- Generate a positive pressure of approx. 1.0 bar using hand pump of cooling system tester.

If the pressure drops:

- Search for leaking areas and repair the malfunction.

Pressure relief valve in cap, checking

- Position Cooling System Tester (VAG1274) with Adapter (VAG1274/9) on 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.