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

Requirement
^ Engine at operating temperature.

Work sequence

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

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 cooling system tester.

If pressure drops:
- Search for leaking areas and repair malfunction.





- Position cooling system tester V.A.G 1274 with adapter V.A.G 1274/9 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.