Cooling System, Checking For Leaks: Procedure

WARNING: This page is about a different car, the 2015 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.

Engine at operating temperature.

CAUTION:

Risk of scalding due to hot coolant

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

-- Wear safety gloves.

-- Wear protective eyewear.

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

-- Remove the coolant expansion tank cap -1- in direction of -arrow-.

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

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-- Generate approximately 1.5 bar (21.75 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.