Charge Air System, Checking For Leaks: Procedure

-- Remove the noise insulation. Refer to NOISE INSULATION .

-- Release the clamp -A- and remove the hose -B- from the charge air pipe.

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-- Attach the -A- :VAG1687/5 to the charge air hose.

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-- Turn the -B- :VAG1687/5 clockwise approximately 90° in direction of -arrow-.

-- Attach the :VAG1687 as illustrated below.

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Prepare the :VAG1687 as Follows:

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-- Pull the pressure regulating valve -2- upward and remove completely, close the valves -3 and 4-.

-- Connect the :VAG1687 to compressed air -1- with a commercially available intermediate piece.

NOTE:

If there is water in the viewing glass -6-, drain it through the drain plug.

-- Open the valve -3-.

-- Set the pressure to 0.5 bar (7.2 psi) using the pressure regulating valve -2-.

-- Open the valve -4- and wait until the test circuit is filled. Regulate the pressure to 0.5 bar (7.2 psi) again if necessary.

-- Inspect the charge air system for poorly sealed areas by listening, feeling, using commercially available leak detection spray or by using the :VAG1842S .

NOTE:

A small quantity of air dissipates via the valves in the engine. For this reason a pressure retention test is not possible.

Refer to the Owner's Manual for information on using the :VAG1842S .

Release the pressure in the test circuit by pulling off the hose coupling before removing the adapter.