Cooling System: Testing and Inspection

Cooling system, checking for leaks





Special Tools and Equipment
^ VAG1274 cooling system tester
^ VAG1274/8
^ VAG1274/9 adapter

Test requirement:
^ Engine at operating temperature.

Test 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 VAG1274 Cooling System Tester together with VAG1274/8 adapter to coolant expansion tank.
- Use tester hand pump to create a pressure of approximately 1.0 bar.
- If pressure drops, detect leak and repair malfunction.





Pressure relief valve in cap, checking
- Attach VAG1274 cooling system tester together with VAG1274/9 adapter to cap.
- Pump using hand pump.
^ Pressure release valve must open at a positive pressure of 1.4 to 1.6 bar.