Screw the cooling system tester VAG 1274 with adapter VAG 1274/8 onto the expansion tank, as shown in Figure 2.238.
Operate the pump and create a pressure of 1.4-1.6 bar.
Check the cooling system for leaks.
Also check the expansion tank cap.
To do this, screw the VAG 1274/9 adapter onto the VAG 1274 cooling system tester (pic. 2.239).
Operate the pump and create a pressure of 1.4-1.6 bar.
The safety valve must not open at pressures up to 1.4 bar.
If the valve in the expansion tank cap opens prematurely, replace the cap.
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