Cooling System, Checking For Leaks: Notes

WARNING: This page is about a different car, the 2024 Audi RS 3. However, it is still accessible from the selected car via links, so may be relevant.

Special tools and workshop equipment required

Cooling System Tester :V.A.G 1274B

Fig 1: Cooling System Tester VAG1274B
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Cooling System Tester - Adapter :V.A.G 1274/8

Fig 2: Identifying Cooling System Tester Adapter
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Cooling System Tester - Adapter :V.A.G 1274/9

Fig 3: Cooling System Tester - Adapter VAG1274/9
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Procedure

Fig 4: Identifying Coolant Reservoir Cap

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Engine at operating temperature.

CAUTION:

The cooling system is under pressure when the engine is warm. There is a risk of scalding due to hot steam and hot coolant.

Scalding the skin and other parts of the body is possible.

- Wear safety gloves.

- Wear protective eyewear.

- Reduce the pressure by covering the coolant expansion tank cap with a cloth and carefully opening it.

-- Open the coolant reservoir cap -arrow-.

-- Position the Cooling System Tester :V.A.G 1274B with the Cooling System Tester - Adapter Cooling System Tester - Adapter :V.A.G 1274/8 on the coolant expansion tank.

Fig 5: Cooling System Tester V. A. G 1274 Connected To Coolant Reservoir

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-- Generate approximately 1 bar (14.5 psi) pressure using the cooling system tester hand pump.

-- If the pressure falls, search for leaks and correct the malfunction.