Skoda Workshop Service and Repair Manuals > Octavia Mk1 > Drive unit | 1.9 l/66 kW TDI Engine, Mechanics | Engine cooling | Removing and installing parts of the cooling system | Checking the coolant system for leaktightness | Inspecting coolant system with cooling system testing device V.A.G 1274 for tightness

Inspecting coolant system with cooling system testing device V.A.G 1274 for tightness

Inspecting coolant system with cooling system testing device -V.A.G 1274- for tightness

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 expansion reservoir is opened. 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.

–	Using the hand pump of the testing device generate an overpressure of approx. 0.1 MPa (1 bar).

–	If the pressure drops determine positions of the leak and repair.

Testing the pressure relief valve in the cap

–	Screw cap onto tester with adapter -V.A.G 1274/9-.

–	Using the hand pump of the testing device generate an overpressure of approx. 0.16 MPa (1.6 bar).

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

The pressure relief valve opens too early or too late.

–	Replace cap.

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