Cooling System: Testing and Inspection

Cooling System, Checking for Leaks

Special tools, testers and auxiliary items required

• Cooling System Tester (V.A.G 1274 B)

• Adapter (V.A.G 1274/8)

• Adapter (V.A.G 1274/9)

Procedure

• The engine is at operating temperature.

The coolant system is under pressure when the engine is warm.

Risk of scalding due to hot steam and hot coolant.

Reduce pressure by covering the coolant expansion tank with a cloth and carefully opening.

- Open the coolant expansion tank cap.

- Install the cooling system tester (V.A.G 1274 B) with the adapter (V.A.G 1274/8) onto the tank.






- Generate approximately 1 bar pressure using the cooling system tester hand pump.

- If the pressure falls, search for leaks and correct problem.

Pressure Relief Valve in Cap, Checking






- Install the cooling system tester (V.A.G 1274 B) with the adapter (V.A.G 1274/9) to the cap.

- Generate pressure with cooling system tester hand pump.

• The pressure release valve must open at 1.4 to 1.6 bar.

- If the pressure relief valve does not open as specified, replace the cap.