Cooling System, Checking For Leaks: Procedure

WARNING: This page is about a different car, the 2018 Volkswagen Jetta, 2017 Volkswagen Jetta, and 2016 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

To perform the leak test correctly, a check (self-test) of the :VAG1274B must be performed first.

Check (Self-Test) of :VAG1274B

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-- Operate the :VAG1274B multiple times.

-- Create a pressure of 3.0 bar (43.5 psi) on the :VAG1274B .

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-- Observe the pressure on the pressure gauge of the :VAG1274B for 30 seconds.

If No Pressure is Built or the Pressure Decreases:

The :VAG1274B is leaking and must not be used.

Cooling System, Checking for Leaks

CAUTION:

The cooling system is under pressure when the engine is warm. 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.

-- Carefully open the cap -1- on the coolant expansion tank -2- in the direction of -arrow-.

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Engine at operating temperature.

-- Position the :VAG1274B with the :VAG1274/8 on the coolant expansion tank.

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-- Generate a positive pressure of approximately 1.0 bar (14.5 psi) using the hand pump on the tester.

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