Skoda Workshop Service and Repair Manuals > Octavia Mk2 > Drive unit | 2.0/125 kW TDI PD Engine | Engine cooling | Removing and installing parts of the cooling system | Checking the coolant system for leaktightness

Checking the coolant system for leaktightness

Special tools and workshop equipment required

t	Cooling system testing device, e.g. -V.A.G 1274-

t	Adapter, e.g. -V.A.G 1274/8-

t	Adapter, e.g. -V.A.G 1274/9-

Test condition

l	Engine must be warm.

Test sequence

WARNING

Hot steam may escape when the coolant expansion reservoir is opened.

t	Wear safety goggles and safety clothing, in order to avoid eye injuries and scalding.

t	Cover the cap with a cloth and open carefully.

–	Open the cap of the coolant expansion reservoir.

–	Position the cooling system testing device -V.A.G 1274- with adapter -V.A.G 1274/8- on the coolant expansion reservoir.

–	Generate an overpressure of approx. 0.1 MPar (1.0 bar) for testing the cooling system.

If the pressure drops:

–	Search position of the leak and repair fault.

–	Position the cooling system testing device -V.A.G 1274- with adapter -V.A.G 1274/9- on the coolant expansion reservoir.

–	Generate an overpressure for testing the pressure relief valve.

l	The pressure relief valve should open at a pressure of 0.14 … 0.16 MPa (1.4 … 1.6 bar).

If the pressure relief valve does not open:

–	Replace cap.

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