WARNING | Steam may be released when opening the expansion tank. Cover the cap with a cloth and open carefully. |
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| Open cap on coolant expansion tank. |
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| Mount the adapter -VAG 1274/8- to the expansion tank. |
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| Place the connecting piece -VAG 1274B/1- on the adapter -VAG 1274/8-. |
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| Connect the connecting piece -VAG 1274B/1- together with the connecting hose of the device to the cooling system tester -VAG 1274B- |
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| Use hand pump on tester to create a pressure of about 1.0 bar. |
WARNING | Risk of burn injuries! Before removing the cooling system tester -VAG 1274B- from the connecting hose or from the connecting piece -VAG 1274B/1-, the pressure must be released. For this purpose, press the pressure relief valve cooling system tester -VAG 1274B- until the pressure gauge displays the value »0«. |
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| Find leaks and rectify. |
| Check pressure relief valve in cap. |
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| Screw cap into adapter for cooling system tester -VAG 1274/9-. |
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| Place the connecting piece -VAG 1274B/1- on the adapter -VAG 1274/9-. |
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| Connect the connecting piece -VAG 1274B/1- together with the connecting hose of the device to the cooling system tester -VAG 1274B- |
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| Use hand pump on cooling system tester to create a pressure of max. 1.6 bar. |
| The pressure relief valve must not open. |
| If the pressure relief valve opens prematurely: |
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| Increase pressure to over 1.6 bar. |
| The pressure relief valve must open. |
| If the release valve does not open: |
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