Skoda Workshop Service and Repair Manuals > Fabia Mk1 > Engine | 1.9/74 TDI Engine, Mechanics | Engine cooling | Parts of cooling system - Summary of components | Checking the coolant system for tightness

Checking the coolant system for tightness

Special tools and workshop equipment required

t	Coolant system tester, 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 coolant system tester (e. g. -V.A.G 1274-) with adapter (e. g. -V.A.G 1274/8-) on the expansion reservoir.

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

–	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 (e.g. -V.A.G 1274/9 -).

–	Using the hand pump of the tester generate an overpressure of approx. 1.5 bar (0.15 MPa).

–	The pressure relief valve must open for an overpressure of 1.2...1.5 bar (0.12...0.15 MPa).

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