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 opening.

- Open coolant reservoir cap.

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

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

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

Pressure Relief Valve in Cap, Checking





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

- Generate pressure with cooling system tester hand pump.

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

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