A3 L4-2.0L Turbo (BPY) (2006)
^ Remove filler cap on expansion tank.
^ Install tester VAG 1274 and adapter VAG 1274/8 on expansion tank (see illustration).
^ Build up a pressure of approximately 1.0 bar with hand pump on tester.
If this pressure is not maintained:
^ Trace and repair leaks.
^ Check if any coolant leak around coolant reservoir still exists.
Pressure relief valve in filler cap, checking:
^ Screw filler cap onto tester with adapter VAG 1274/9.
^ Install hand pump and build up pressure.
^ Pressure relief valve should open at 1.4 to 1.6 bar.
^ Replace filler cap if necessary.