Cooling System: Testing and Inspection

Cooling system, checking for leaks

Special tools and equipment:

^ VAG1274 Cooling system tester
^ VAG1274/8 Adapter
^ VAG1274/9 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 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





- Using VAG1274/9 adapter attach VAG1274 cooling system tester to coolant reservoir tank cap.
- Pump using hand pump.
^ Pressure release valve must open at a positive pressure of 1.4 to 1.6 bar