Cooling System: Testing and Inspection

Cooling system, checking for leaks





Special Tools and Equipment

^ VAG 1274 Cooling system tester
^ VAG 1274/8 Adapter
^ VAG 1274/9 Adapter

Requirement

^ Engine at operating temperature.

Work sequence

WARNING!
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.





- Attach VAG 1274 Cooling System Tester together with VAG 1274/8 adapter to coolant expansion tank.
- Use tester hand pump to create a pressure of approx. 1.0 bar.

If pressure drops:

- Detect leak and repair malfunction.

Pressure relief valve in filler cap, checking





- Attach VAG 1274 cooling system tester together with VAG 1274/9 adapter to filler cap.
- Pump using hand pump.
^ Pressure release valve must open at a positive pressure of 1.4 to 1.6 bar.

If the pressure relief valve does not open as described:

- Replace filler cap.