Filling The Cooling System (Includes Bleeding)

Information 

• The amount of coolant available must be approx. 2 litres more than the amount to be filled in. 
• Because different quantities of coolant can drain away during different types of repairs, the filling capacity can vary greatly. Recommendation: To be on the safe side, fill the canister to 30 l, then bleed the cooling system. The difference after bleeding is the coolant quantity that is sucked in. Check the volume scale on the canister. 
• An antifreeze content of -35°C corresponds to a mixture of 50: 50 (antifreeze: water). 

Information 

• The filling process is completed more quickly if the canister is positioned at roughly the same height as the coolant reservoir. 

Information 

• A hissing sound after connecting the compressed air supply is usual. 

Information 

• If no vacuum is generated (the pointer does not move to the green area), there is a leak in the cooling system. 
• If a vacuum is still not established, there is a blockage in the tool. Clean the device, use clean compressed air. 
• Deformation of the rubber hoses of the cooling system is normal. 
• Pressure of between 6 and 10 bar must be present. The higher the pressure, the better the vacuum in the vehicle cooling system. 
• When the pressure gauge pointer is in the green area of the display scale, a sufficient vacuum has been built up. 
• After both shutoff valves on the vacuum pressure gauge have been closed and the compressed air supply has been disconnected, the vacuum must not drop. If the vacuum drops within approx. 30 seconds, there is a leak in the coolant circuit. 

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Illustration of vacuum-filling device setup

1. If you have not already done so, screw cap adapter K65 for coolant expansion tank onto the reservoir.
2. Connect the flexible extension (FZ 100) to the cap.
3. Connect the vacuum gauge of the > 9781 - bleeder tool to the flexible extension. When doing so, make sure that both shut-off valves are closed (positioned at 90° with respect to flow direction).
4. Connect the Venturi nozzle to the vacuum gauge. > Connecting Venturi nozzle to vacuum pressure gauge 

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   Connecting Venturi nozzle to vacuum pressure gauge

5. Place a canister with a sufficient amount of coolant and with an antifreeze content of -35°C beside the vehicle close to the reservoir.
6. Push the filler hose -5-  of the vacuum pressure gauge onto the canister connection. Route the return line -6-  from the Venturi nozzle to a second container (bucket).

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   Components of vacuum-filling device

7. Connect the compressed air supply.

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   Connecting compressed air supply

8. Open > Shut-off valves on vacuum pressure gauge  both shut-off valves on the vacuum gauge until the transparent filler hose is completely filled with coolant.

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   Shut-off valves on vacuum pressure gauge

9. Close the left shutoff valve (V1) -arrow -  on the vacuum gauge and allow a vacuum to build up in the coolant circuit.

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   Closing left shut-off valve (V1)

10. When there is a sufficient vacuum in the cooling system (indicator is in the green area), close the right shutoff valve (V2) and then disconnect the compressed air supply.

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    Closing right shut-off valve (V2) when there is a sufficient vacuum

11. Re-open the left shut-off valve (V1) on the vacuum pressure gauge. The cooling system is then filled.
12. When there is no trace of vacuum present or the coolant is no longer drawn from the canister, open the right shutoff valve (V2). > Opening right shut-off valve 

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    Opening right shut-off valve

13. Then remove the complete filling tool (including the adapter K65).
14. If necessary, fill the coolant reservoir with coolant up to the maximum marking.

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    Coolant reservoir

15. Start the engine and leave it running at idle speed. Move the selector lever to position "P" and allow the engine to warm up.
16. Switch on passenger compartment heating. Blower setting: one bar.
17. Press the "Sport button". Leave "Sport" mode activated during the bleeding process.
18. Check the following while the vehicle is warming up.
    1. 18.1 Coolant temperature -2-  and engine oil temperature -1-  in the instrument cluster. Figure shows normal, acceptable values.

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       Checking temperature on instrument cluster (shown as an example in illustration)

    2. 18.2 Feel the supply and return coolant hoses for the radiator and the peripheral engine cooling hoses to check that they are heating up uniformly.
    3. 18.3 It should be possible to force any suspected air bubbles through the cooling system by pressing the accelerator pedal from idle speed to approx. 3, 500 rpm -3-  during the warm-up phase. Never supply power to the map-controlled thermostat using the workshop tester.

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       Revs on the rev counter (shown as an example)

    4. 18.4 The cooling system has been filled and bled correctly if =>
       • All coolant hoses are uniformly warm.
       • The temperature display in the instrument cluster is in the normal range.
       • The passenger compartment heater is warm.
       • The electric fan for engine cooling comes on.
19. Fit cap on the coolant reservoir.
20. Close the service clip on the bleeder valve assembly.
21. Close the maintenance cover.