Cooling System, Checking For Leaks

Cooling System, Checking for Leaks

Special tools, testers and auxiliary items required

• Cooling system tester (V.A.G 1274)

• Adapter for cooling system tester (V.A.G 1274/8)

• Adapter for cooling system tester (V.A.G 1274/9)

Test Conditions

• Engine at operating temperature

Test Sequence

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

- Open cap of coolant expansion tank.

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





- Generate a positive pressure of approximately 1.0 bar using hand pump of tester.

If the pressure drops:

- Search for leaking areas and repair the malfunction.

Pressure Relief Valve in Cap, Checking

- Position cooling system tester (V.A.G 1274) with adapter (V.A.G 1274/9) on cap.





- Operate hand pump.

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