Cooling System: Testing and Inspection

Cooling system, checking for leaks

Test requirement:

^ Engine at operating temperature.

WARNING!
Hot steam can escape when the cap on the expansion tank is opened. Cover the cap with a cloth, and open it carefully.

- Remove cap from coolant expansion tank.





- Install tester V.A.G. 1274 with adapter V.A.G. 1274/8 onto expansion tank.
- Using hand pump on tester, build up a pressure of approx. 1.0 bar.
- If this pressure drops, locate leak and repair.

Testing pressure relief valve in filler cap.

- Screw filler cap onto tester with adapter V.A.G. 1274/9.





- Attach hand pump and build up pressure.
- The pressure relief valve should open at a pressure of 1.4 - 1.6 bar.