Cooling System: Testing and Inspection

Cooling System, Checking for Leaks

Special tools, testers and auxiliary items required

• Cooling system tester (V.A.G 1274)

• Adapter (V.A.G 1274/8)

• Adapter (V.A.G 1274/9)

Test conditions

• Engine at operating temperature.

Test sequence

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

- Open cap of coolant expansion tank.

- Attach cooling system tester (V.A.G 1274) with adapter (V.A.G 1274/8) to expansion tank.





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

- If pressure decreases, search for leaking areas and repair malfunction.

Pressure relief valve in cap, checking

- Attach cooling system tester (V.A.G 1274) with adapter (V.A.G 1274/9) to expansion tank cap.





- Operate hand pump.

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