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.

• When the engine is warm the cooling system is under pressure.

• Reduce pressure by covering coolant reservoir cap with a cloth and carefully open.

- Open 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 hand pump of cooling system tester.

- If pressure decreases, search for leaking areas and repair the malfunction.

Checking Pressure Relief Valve in Cap






- 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.