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

• Engine at operating temperature.


Risk of scalding due to hot steam and hot coolant.

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

• Cover the coolant reservoir cap with a cloth and then open it slowly to release the pressure.

- Open the coolant reservoir cap.






- Position (V.A.G 1274 B) with (V.A.G 1274/8) on coolant reservoir.

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

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

Check the Pressure Relief Valve Inside the Cap.






- Attach (V.A.G 1274 B) with (V.A.G 1274/9) to sealing cap.

- Generate pressure with cooling system tester hand pump.

• The pressure release valve must open at 1.4 to 1.6 bar (20.30 to 23.20 psi).

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