VW Golf manuals

Volkswagen Golf Service & Repair Manual: 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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