Cooling System, Checking For Leaks: Notes

WARNING: This page is about a different car, the 2023 Volkswagen Atlas. However, it is still accessible from the selected car via links, so may be relevant.

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Special tools and workshop equipment required

Cooling System Tester - Adapter:V.A.G 1274/8
Cooling System Tester - Adapter:V.A.G 1274/9
Cooling System Tester:V.A.G 1274 B

NOTE:

To perform the leak test correctly, a check (self-test) of the Cooling System Tester:V.A.G 1274 B must be performed first.

Cooling System Tester:V.A.G 1274 B , Checking (Self-Test)

Fig 1: Special Tool VAG1274B

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-- Operate the Cooling System Tester:V.A.G 1274 B multiple times.

-- Create a pressure of 3.0 bar (43.51 psi) on the Cooling System Tester.

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-- Observe the pressure on the pressure gauge of the Cooling System Tester for 30 seconds.

If no pressure is built or the pressure decreases:

The Cooling System Tester:V.A.G 1274 B is leaking and must not be used.

Cooling System, Checking for Leaks

Fig 2: Identifying Coolant Reservoir Cap

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Engine at operating temperature.

CAUTION:

The cooling system may be under pressure. 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 suitable towel and carefully opening it.

-- Open the coolant reservoir cap -arrow-.

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

Fig 3: Cooling System Tester V. A. G 1274 Connected To Coolant Reservoir

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-- Generate approximately 1.5 bar (21.76 psi) pressure with cooling system tester hand pump.

The pressure must not drop more than 0.2 bar (2.9 psi) within 10 minutes.

-- If the pressure falls more than 0.2 bar (2.9 psi), search for leaks and correct the problem.

NOTE:

The pressure decrease of 0.2 bar (2.9 psi) within 10 minutes is a condition of the cooling of the coolant. The colder the engine the more the pressure decrease. If necessary repeat the test with the engine cold.