Coolant Concentration, Checking

Coolant Concentration, Checking

• It is necessary to check the coolant concentration to determine if there is air in the coolant system.

Special tools, testers and auxiliary items required

• Cooling System Tester (V.A.G 1274 B)

• Adapter (V.A.G 1274/8)

- Open the coolant expansion tank cap.

- Install the cooling system tester (V.A.G 1274 B) with the adapter (V.A.G 1274/8) onto the coolant expansion tank.






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

- Check the coolant level inside the expansion tank.

There are no leaks in the coolant system if the coolant level goes down by only a maximum of 25 mm. If the level goes down significantly or if the coolant evaporates from the expansion tank, this means there are air bubbles in the coolant system.

Coolant Level is OK:

- Perform a road test until the engine operating temperature is reached.

- Check the coolant level.

If the Coolant Level goes Down Significantly:

- Drain the cooling system. Refer to => [ Draining the Engine/Heater Circuit ] Draining and Filling, High Temperature Coolant Circuit.

- Fill the cooling system. Refer to => [ Draining and Filling, High Temperature Coolant Circuit ] Draining and Filling, High Temperature Coolant Circuit.

- Recheck the coolant concentration.