SEAT Workshop Service and Repair Manuals > Leon Mk1 > Power unit | 4-cylinder TDI diesel engine with pump injector unit, 2.0 litre and 2v, mechanics | Engine cooling | Parts of cooling system: Removing and installing

Cooling system: checking seal

t	Test sequence → Anchor

t	Testing pressure relief valve in cap → Anchor

Check the tool and equipment equivalence table according to the applicability between Seat / VW / Audi / Skoda → Chapter

Special tools and workshop equipment required

t	Coolant tester -VAG 1274B-, see equivalent → Anchor

t	Adapters -VAG 1274/8-

t	Adapters -VAG 1274/9-

Test prerequisites

l	Engine at operating temperature

Test 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 -V.A.G 1274B- 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 cap

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

–	Operate hand vacuum pump.

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

–	If the valve does not open:

l	Replace the cap.

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