SEAT Workshop Service and Repair Manuals > Leon Mk2 > Power unit | 4 cylinder TDI Engine, 2.0 l, 4 V with injector pump, mechanics | Engine cooling | Components of the cooling system: removing and fitting

Cooling system: checking the seal

Consult the equivalence table for tools and equipment according to applicability among Seat / VW / Audi / Skoda → Chapter.

Special tools and workshop equipment required

t	Coolant tester -SAT 1274-, see equivalent → Anchor

t	Adapter -VAG 1274/8-, see equivalent → Anchor

t	Adapter -VAG 1274/9-, see equivalent → Anchor

Test prerequisites

l	Engine at operating temperature

Checking sequence

WARNING

Hot vapour/hot coolant may escape when opening expansion tank. Cover cap with cloth and open carefully.

–	Open the cap of the coolant expansion tank.

–	Fit the cooling tester -SAT 1274- with the adapter -V.A.G 1274/8- onto the expansion tank.

–	Use the hand pump on the tester to create an overpressure of approx. 1.0 bar.

If the pressure drops:

–	Find the leaks and repair them.

Testing pressure relief valve in filler cap

–	Fit the cooling tester -SAT 1274- with the adapter -V.A.G 1274/9- onto the filler cap.

–	Operate hand vacuum pump.

l	At a pressure of 1.4 ... 1.6 bar, the pressure release valve should open.

If, contrary to that indicated, the charge pressure valve does not open:

–	replace the cap.

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