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.

Risk of scalding due to hot steam and hot coolant.

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

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

- Open the coolant expansion tank cap.

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






- Generate approximately 1 bar (14.6 psi) pressure using the cooling system tester hand pump.

- If the pressure falls, search for leaks and correct the 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 using the cooling system tester hand pump.

• The pressure release valve must open at 1.4 to 1.6 bar (20.4 to 23.3 psi).

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