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.

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

- Open the coolant reservoir cap.

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

Pressure Relief Valve In Cap, Checking






- 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).