SEAT Workshop Service and Repair Manuals > Leon Mk2 > Power unit | 4-cylinder diesel engine (1.9 l engine) | Engine cooling | Removing and installing parts of cooling system

Checking cooling system for leaks

Special tools and workshop equipment required

t	Cooling system tester -V.A.G 1274-

t	Adapter for cooling system tester -V.A.G 1274/7-

t	Adapter for cooling system tester -V.A.G 1274/8-

t	Adapter for cooling system tester -V.A.G 1274/9-

Test prerequisite

l	Engine at operating temperature

Test procedure:

WARNING

Hot steam may escape when expansion tank is opened. Place rag over cap and open with caution.

–	Open cap on coolant expansion tank.

–	Attach cooling system tester -V.A.G 1274- with cooling system tester adapter -V.A.G 1274/8- or cooling system tester adapter -V.A.G 1274/7- onto expansion tank.

–	Use hand pump on tester to create a pressure of about 1.0 bar.

If pressure drops:

–	Find leaks and rectify.

Checking pressure relief valve in filler cap

–	Attach cooling system tester -V.A.G 1274- with cooling system tester adapter -V.A.G 1274/9- to cap.

–	Use hand pump on cooling system tester to create a pressure of max. 1.6 bar.

The pressure relief valve must not open.

If the pressure relief valve opens prematurely:

–	Renew sealing cap.

–	Increase pressure to over 1.6 bar.

The pressure relief valve must open.

If the pressure relief valve does not open:

–	Renew sealing cap.

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