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 in the system.

- Open the coolant reservoir cap.

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






- Generate a positive pressure of approximately 1.0 bar using the hand pump on the cooling system tester.

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

Pressure Relief Valve in Cap, Checking






- Mount the (V.A.G 1274 B) with the (V.A.G 1274/9) on the cap.

- Generate pressure with cooling system tester hand pump.

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

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