Volkswagen Golf Service & Repair Manual: Checking cooling system for leaks

Volkswagen Golf Service & Repair Manual / 4- cylinder injection engine(1.4 1 direct inction. turbocharger) / Engine cooling / Cooling system, coolant / Checking cooling system for leaks

Special tools and workshop equipment required

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

Checking cooling system for leaks

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

Checking cooling system for leaks

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

Procedure

Checking cooling system for leaks

–	Open cap -arrow- on coolant expansion tank.

Engine at operating temperature.

The cooling system is under pressure when the engine is hot. Hot steam/hot coolant can escape - risk of scalding. Risk of scalding to skin and body parts.Wear protective gloves.Wear eye protection.Release pressure by covering cap of coolant expansion tank with a cloth and opening it carefully.

Checking cooling system for leaks

–	Fit cooling system tester -V.A.G 1274 B- with adapter -V.A.G 1274/8- on coolant expansion tank.

–	Using hand pump on tester, build up a pressure of approx. 1.0 bar.

–	If this pressure is not maintained, locate and rectify leaks.

Checking cooling system for leaks

Checking pressure relief valve in filler cap

–	Place cooling system tester -V.A.G 1274 B- with adapter -V.A.G 1274/9- on filler cap.

–	Build up pressure using hand pump of cooling system tester.

The pressure relief valve must open at a pressure of 1.6…1.8 bar.

Checking cooling system for leaks

Draining and filling coolant

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Coolant pump, regulation of cooling system

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