To check the tightness of the system, install the VW 1274 tester on the expansion tank.
Using the device, create an excess pressure of 1 kgf / cm 3 in the cooling system2. If the system is tight, the pressure should not decrease.
To check the pressure reducing valve in the plug of the expansion tank, install the plug in the tester. Using the device, creating excess pressure in the cooling system, check the operation of the pressure reducing valve of the expansion tank plug, which should open at an excess pressure of 0.9-1.15 kgf / cm2.
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