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| Engine at operating temperature. |
WARNING | Hot steam may escape when expansion tank is opened. Place cloth over cap and open with caution. |
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| Open filler cap on coolant expansion tank. |
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| Screw adapter for cooling system tester -V.A.G 1274/8- into coolant expansion tank. |
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| Clamp connector -V.A.G 1274 B/1- into adapter for cooling system tester -V.A.G 1274/8-. |
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| Join connection piece -V.A.G 1274 B/1- to cooling system tester -V.A.G 1274 B- using connecting hose supplied. |
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| Using hand pump on tester, build up a pressure of approx. 1.0 bar. |
WARNING | Risk of scalding! Before disconnecting cooling system tester -V.A.G 1274 B- from connecting hose or connector -V.A.G 1274 B/1-, relieve existing pressure under all circumstances. To do this, press pressure relief valve on cooling system tester -V.A.G 1274 B- until pressure gauge displays value of »0«. |
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| Find leaks and rectify. |
| Check pressure relief valve in filler cap. |
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| Screw cap into adapter for cooling system tester -V.A.G 1274/9-. |
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| Clamp connector -V.A.G 1274 B/1- into adapter for cooling system tester -V.A.G 1274/9-. |
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| Join connection piece -V.A.G 1274 B/1- to cooling system tester -V.A.G 1274 B- using connecting hose supplied. |
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| Using hand pump on cooling system tester, build up a pressure of approx. 1.6 bar. |
| The pressure relief valve must not open. |
| If the pressure relief valve opens prematurely: |
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| Replace the sealing plug. |
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| Increase pressure to over 1.6 bar. |
| The pressure release valve should open. |
| If the pressure relief valve does not open: |
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| Replace the sealing plug. |
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