Checking Coolant Expansion Tank For Leaks

Check the cap.

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Tester on cap
1. 1.1 > V.A.G 1274B - Cooling system tester with > V.A.G 1274B/15 - adapter for cooling system tester must be fitted on the cap.
2. 1.2 Use > V.A.G 1274B - cooling system tester to create overpressure of about 2 bar.
3. 1.3 Check the pressure:
  The overpressure must drop to 1.8 to 1.6 bar and stay at this level.
4. 1.4 If the overpressure does not behave as described:
  Replace the cap.