Volkswagen Golf Service & Repair Manual: Checking cooling system for leaks
| Special tools and workshop equipment
required |
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| Cooling system tester -V.A.G 1274 B- |
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| Adapter for cooling system tester -V.A.G 1274/8- |
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| Adapter for cooling system tester -V.A.G 1274/9- |
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Open cap -arrow- on coolant
expansion tank. |
| Engine at operating temperature. |
The cooling system is under pressure when the engine is hot. Hot
steam/hot coolant can escape - risk of scalding. Risk of scalding to
skin and body parts.Wear protective gloves.Wear eye protection.Release
pressure by covering cap of coolant expansion tank with a cloth and
opening it carefully. |
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Fit cooling system tester -V.A.G 1274 B- with adapter -V.A.G 1274/8-
on coolant expansion tank. |
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Using hand pump on tester, build up a pressure of approx.
1.0 bar. |
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If this pressure is not maintained, locate and rectify
leaks. |
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| Checking pressure relief valve in filler cap |
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Place cooling system tester -V.A.G 1274 B- with adapter -V.A.G 1274/9-
on filler cap. |
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Build up pressure using hand pump of cooling system tester. |
| The pressure relief valve must open at a pressure of
1.6…1.8 bar. |
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Special tools and workshop equipment required
Refractometer -T10007 A-
Drip tray for workshop hoist -VAS 6208-
Hose clip pliers -VAS 634 ...
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Draining and filling coolant