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Coolant pump, thermostat, coolant pipes >
< Removing and installing radiator fans
A5
Power unit
8-cylinder direct petrol injection engine (4.2 ltr. 4-valve), mechanics
Engine cooling
Cooling system
Checking cooling system for leaks
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-
Procedure
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Engine must be warm.
WARNING
Hot steam/hot coolant can escape - risk of scalding.
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The cooling system is under pressure when the engine is hot.
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Cover filler cap on coolant expansion tank with a cloth and open carefully to dissipate pressure.
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Open filler cap on coolant expansion tank.
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Fit cooling system tester -V.A.G 1274 B- with adapter -V.A.G 1274/8- onto coolant expansion tank.
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Using hand pump on cooling system tester, build up a pressure of approx. 1.0 bar.
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If this pressure is not maintained, locate and rectify leaks.
Checking pressure relief valve in filler cap
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Fit cooling system tester -V.A.G 1274 B- with adapter -V.A.G 1274/9- onto filler cap.
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Build up pressure with hand pump on cooling system tester.
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The pressure relief valve should open at a pressure of 1.4 ... 1.6 bar.
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Renew filler cap if pressure relief valve does not open as described.
Power unit
8-cylinder direct petrol injection engine (4.2 ltr. 4-valve), mechanics
Engine cooling
Cooling system
Coolant pump, thermostat, coolant pipes >
< Removing and installing radiator fans