Pour in coolant and bleed cooling system - AR20.00-P-1142-04A

ENGINE 133, 152, 155, 156, 157, 159, 177, 178, 270, 271, 272, 273, 274, 275, 276, 277, 278, 279 

ENGINE 157, 176, 642 

ENGINE 607, 628, 629, 642, 651 

Fig 1: Identifying Electric Vacuum Pump (285 589 02 21 00)

Courtesy of MERCEDES-BENZ USA

Fig 2: Identifying NTKL Adaption (285 589 01 21 00)

Courtesy of MERCEDES-BENZ USA

Fig 3: Identifying Cooler Vacuum Filling Device (285 589 00 21 00)

Courtesy of MERCEDES-BENZ USA

Fig 4: Identifying Test Cap (210 589 00 91 00)

Courtesy of MERCEDES-BENZ USA

Engine 133, 157, 274, 276.8, 278

Engine 157, 176

Engine 177, 178

Engine 642, 651

Also repeat the ventilation process for the low-temperature circuit.

Only ventilate the engine cooling system for a cold engine.

The drainage container for NTKL adaptation (13) should be emptied after beginning work.

Shown on engine cooling system main circuit in model 171 

Fig 5: Pouring Coolant And Bleed Cooling System

Courtesy of MERCEDES-BENZ USA

1. Bring coolant reservoir (4a) of the vacuum-type cooling system filler to the same height as the coolant expansion reservoir (1).
2. Unscrew cooling system closure cap (10) and screw on tester cap (2) at coolant expansion reservoir (1).
3. Attach the control unit (3) to the tester cap (2).
4. Attach Venturi nozzle (9) to control unit (3).
5. Close drain valve (8) and feed valve (7).
6. Place feed hose (4) of the coolant on the coolant reservoir (4).

   In order to avoid suctioning up of air in coolant reservoir (4a) and for completeness of the filling capacity of the engine cooling system in the vehicle, always completely fill up the coolant reservoir (4a).

7. Guide waste air hose (5) into an empty container (5a).
8. Connect compressed air hose (6) to the Venturi nozzle (9) and apply pressure.

   The overpressure in the compressed air supply must be at least about 8 bar so that sufficient vacuum can be generated through the Venturi nozzle (9).

9. Open the drain valve (8).

   A vacuum is created in the engine cooling system.

10. Open feed valve (7) until feed hose (4) has filled with coolant and subsequently close feed valve (7) again.
11. Close drain valve (8) if display of the control unit (3) is in the green area.
12. Remove compressed air hose (6) from the Venturi nozzle (9) and monitor if the vacuum remains stable for 30 seconds.

    If this is not the case

    Check hoses and connections for damage, repair if necessary and again create a vacuum

13. Close feed valve (7) and drain valve (8).
    Fig 6: Checking Hoses And Connections For Damage

    Courtesy of MERCEDES-BENZ USA
14. Bring switch (11) of the electrical vacuum pump (18) in position 0.
15. Connect the positive and negative terminal of the electrical vacuum pump (18) using a suitable 12 V voltage source.

    Observe polarity of the positive and negative terminal of the electrical vacuum pump (18).

16. Hook bracket (12) into the NTKL adaptation (13).
17. Connect hose (14) to the NTKL adaptation (13).
18. Close off shutoff valves (15, 16, 17).
19. Attach hose (20) to the NTKL adaptation (13).
20. Decouple venturi nozzle (9) and replace by a hose (20).
21. Switch in electrical vacuum pump (18) and open stopcock (15).

    The vacuum indicator (19) must indicate at least -0.9 bar.

22. Open the drain valve (8).

    The feed valve (7) must remain closed.

    Evacuate the whole engine cooling system for 5 minutes. The indicator for the vacuum indicator (19) must be above the -0.9 bar marking.

23. Close drain valve (8).
24. Switch off electrical vacuum pump (18).

    Bring switch (11) of the electrical vacuum pump (18) in position 0.

25. Remove hose (14) and display vacuum in NTKL adaptation (13) until the display (19) displays 0.0 bar.
26. Check the whole engine cooling system by means of a visual inspection for 30 s for leaktightness.

    Shown on engine cooling system main circuit in model 231 

    Fig 7: Checking Whole Engine Cooling System

    Courtesy of MERCEDES-BENZ USA
27. Open feed valve (7).

    The engine cooling system is filled.

    Filling is complete when the control unit (3) shows 0.0 bar.

28. Open drain valve (8) if coolant is no longer suctioned.
29. Remove control unit (3) along with all connections and tester cap (2).
30. Screw cooling system cap (10) onto coolant expansion reservoir (1).
31. Correct coolant level in coolant expansion reservoir (1).