Cooling System: Testing and Inspection

Cooling system, checking for leaks

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 malfunction.

Checking 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.

Pressure relief valve should open at a pressure of 1.4 - 1.6 bar.