Radiator Cap: Testing and Inspection

Pressure Relief Valve in Cap, Checking

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 cap in the adapter (V.A.G 1274/9).

- Clamp connecting piece (V.A.G 1274 B/1) in the adapter (V.A.G 1274/9).

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

- Generate a maximum pressure of 1.6 bar using the cooling system tester hand pump.

• Pressure relief valve must not open yet.

If pressure relief valve opens prematurely:

- Replace cap.

- Increase pressure to above 1.6 bar.

• Pressure relief valve must open.

If pressure relief valve does not open, replace cap.: