Cooling System: Testing and Inspection

Cooling system, checking for proper seal

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 approximately 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