Leaks in the cooling system and the functioning of the safety valve in the radiator cap can be checked using the VAG 1274 and 1274/4.
Install the device on the filler neck of the expansion tank. Using the hand pump of the device, create an overpressure of approximately 1 bar and hold. If the pressure drops, check the cooling system visually for leaks and repair the leak.
To check the safety valve in the cover of the expansion tank, put the device on the cover. Pressurize with a hand pump. At an overpressure of 1.3-1.5 bar the safety valve should open.
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