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 for cooling system tester (V.A.G 1274/8)

• Adapter for cooling system tester (V.A.G 1274/9)

Pressure Relief Valve in Cap, Checking, refer to --> [ Pressure Relief Valve in Cap, Checking ] Testing and Inspection.

Test Conditions

• Engine at operating temperature

Test Sequence

CAUTION!
Risk of scalding due to hot steam and hot coolant:

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

• Wear protective goggles and protective clothing to prevent damage to eyes and scalding.

• Reduce the pressure by covering the coolant reservoir cap with a rag and opening it carefully.

- Open coolant reservoir cap.

- Install adapter (V.A.G 1274/8) in coolant reservoir.

- Clamp connecting piece (V.A.G 1274 B/1) in adapter (V.A.G 1274/8).

- Connect connector piece (V.A.G 1274 B/1) to cooling system tester (V.A.G 1274 B) using connecting hose.

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

CAUTION!
Risk of scalding due to hot steam and hot coolant:

• Reduce the pressure before disconnecting the cooling system tester (V.A.G 1274 B) from the connecting hose or connector piece (V.A.G 1274 B/1).

• To do this, press the pressure release valve on the cooling system tester (V.A.G 1274 B) until the manometer displays 0.

If the pressure drops, look for leaks and correct.