SEAT Workshop Service and Repair Manuals

Checking charge air system for leaks Special tools and workshop equipment required

t  Cooling system leakage check -VAG 1687-, see equivalent → Anchor

Operation process –  Release quick-fasteners -1- and -2-, and take off front noise insulation.

–  Open hose clip -arrow-, detach air hose and swivel to side.

–  Install adapter -1687/10-, -1687/11- or -1687/12- on vent hose -1- depending on hose diameter and fasten with hose clamp. –  Connect the cooling system leakage check -VAG 1687- as described below:

–  Unscrew pressure control valve -2- completely and close valves -3- and -4-.   Note To turn the pressure regulating valve -2- the knob must be pulled upwards. –  Connect the cooling system leakage check -VAG 1687- to the compressed air system -1- using a common connecting piece.   Note If there is water in sight glass, remove drain plug -6- and drain water. –  Open valve -3-.   Caution Risk of damage if pressure is set too high. The pressure must not exceed 0.5 bar. –  Adjust pressure to 0.5 bar via pressure control valve -2-. –  Open valve -4- and wait until test system is pressurised. If necessary, adjust pressure to 0.5 bar again. –  Check charge air system for audible leaks or leaks that can be felt with the hand; apply commercially available leak detecting spray or use ultrasonic tester -V.A.G 1842-.   Note t  A small amount of air escapes through the valves and enters the engine. Therefore it is not possible to perform a pressure retention test. t  How to use tester ultrasonic tester -V.A.G 1842- → Operating instructions Assembling Installation is carried out in the reverse sequence; note the following:   Note t  Release pressure in test circuit by detaching coupling from adapter before removing adapter. t  Hose connections and air pipes and hoses must be free from oil and grease before fitting. t  Secure all hose connections with the correct type of hose clips (same as original equipment) → Spare parts catalogue.

–  Install air hoses with screw clamps → Fig.

–  Mount the front noise insulation and fasten the quick connectors -1 ... 3-.