Component Tests and General Diagnostics

17 00 009 - Checking cooling system for leaks (N73)





Special tools required:
- 17 0 101 17 0 100 Tester
- 17 0 102 17 0 100 Tester
- 17 0 105 17 0 100 Tester
- 17 0 106 17 0 100 Tester





Warning!
Danger of scalding!

Only perform this work after engine has cooled down.





Checking for leaks in cooling circuit:

Open cap on coolant expansion tank.

Fit special tools 17 0 105 17 0 100 Tester / 17 0 101 17 0 100 Tester.

Build up gauge pressure of 2 bar, wait approx. 2 minutes.

Cooling system is leak-free if pressure drop is max. 0.1 bar.





Checking function of cap:

Fit special tools 17 0 101 17 0 100 Tester / 17 0 102 17 0 100 Tester / 17 0 106 17 0 100 Tester.

Screw sealing cap onto special tool.

Note:
Pressure relief valve must open between 1.75 and 2.2 bar.

Build up pressure with special tool 17 0 101 17 0 100 Tester and observe pressure gauge to ascertain when opening pressure is achieved. Note down measured opening pressure.

After a waiting period of approx. 30 seconds, the pressure must no longer drop by more than 0.4 bar below the measured opening pressure.





Remove special tools.

Check liquid level in cooling system; if necessary: replenish.