Fill And Bleed Low-Temperature Circuit - AR09.41-P-6834-01SVZ

Engine 279 in model 223 

	Risk of injury  to skin and eyes suffering scalding from contact with hot coolantspray. Risk of poisoning  from swallowing coolant.	Do not open cooling system unless coolant temperature is below 90°C. Open cap slowly and release the overpressure. Do not pour coolant into beverage containers. Wear protective gloves, protective clothing and safety glasses.	AS20.00-Z-0001-01A
Notice	Notes on coolant		AH20.00-P-2080-01KOA
	Notes on coolant level		AH20.00-P-1142-01CW

Fig 1: Identifying NTKL Adaption (285 589 01 21 00)

Courtesy of MERCEDES-BENZ USA

Fig 2: Identifying Test Cap (210 589 00 91 00)

Courtesy of MERCEDES-BENZ USA

Fig 3: Identifying Pressure Pump (124 589 24 21 00)

Courtesy of MERCEDES-BENZ USA

Fig 4: Identifying Electric Vacuum Pump (285 589 02 21 00)

Courtesy of MERCEDES-BENZ USA

Fig 5: Identifying Cooler Vacuum Filling Device (285 589 00 21 00)

Courtesy of MERCEDES-BENZ USA

Do not fill low-temperature circuit without activating fill mode.

Proper distribution of the coolant is otherwise not ensured.

Only fill and bleed low-temperature circuit when engine is cold.

Drainage tank of low-temperature circuit adaptation must be empty prior to starting work.

1. Position coolant reservoir (4.1) of vacuum-type cooling system filler at same height as low-temperature circuit expansion reservoir (1).
2. Attach tester cap (2) to low-temperature circuit expansion reservoir (1).
3. Connect pressure pump to tester cap (2).
4. Apply test pressure to low-temperature circuit for 2 min.

   Do not exceed the test pressure.

   If pressure loss is displayed:

   ↓

   Perform visual check of coolant-conducting component parts.

5. Remove pressure pump.
6. Connect control unit (3) to tester cap (2).
7. Connect Venturi nozzle (9) to control unit (3).
8. Close drain valve (8) and feed valve (7).
9. Connect feed hose (4) for coolant to coolant reservoir (4.1).

   Always fill up coolant reservoir (4.1) completely to prevent intake of air into coolant reservoir (4.1) and to verify filling capacity of low-temperature circuit in vehicle.

10. Insert drain hose (5) into an empty tank (5.1).
11. Connect compressed-air hose (6) to Venturi nozzle (9) and apply pressure.

    The overpressure in the compressed-air supply system must be at least 8 bar so that sufficient vacuum can be generated by the venturi nozzle (9).

    Courtesy of MERCEDES-BENZ USA

12. Open the drain valve (8).

    A vacuum is generated in low-temperature circuit.

13. Open feed valve (7) until feed hose (4) has filled with coolant, then close feed valve (7) again.
14. Close drain valve (8) if display of the control unit (3) is in the green area.
15. Disconnect compressed-air hose (6) from Venturi nozzle (9) and observe whether vacuum remains stable for 30 s.

    If this is not the case,

    ↓

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

    Courtesy of MERCEDES-BENZ USA

16. Move switch (11) of electric vacuum pump (18) to 0 position.
17. Connect positive and negative clamps of electric vacuum pump (18) to a suitable 12 V voltage source.

    Observe polarity of positive and negative clamps of electric vacuum pump (18).

    Otherwise, electric vacuum pump (18) will be damaged.

18. Attach bracket (12) to NTKL adaptation (13).
19. Connect hose (14) to the NTKL adaptation (13).
20. Close off shutoff valves (15, 16, 17).
21. Attach hose (20) to the NTKL adaptation (13).
22. Decouple venturi nozzle (9) and replace by a hose (20).
23. Switch in electrical vacuum pump (18) and open stopcock (15).
24. Open the drain valve (8).

    The feed valve (7) must remain closed.

    Evacuate low-temperature circuit for 5 min. Pointer of vacuum display (19) must be above 0.9 bar mark.

25. Close drain valve (8).
26. Switch off electrical vacuum pump (18).
27. Disconnect hose (14) and reduce vacuum in low-temperature circuit adaptation (13) until vacuum display (19) shows 0.0 bar.
28. Check low-temperature circuit for leaks for 30 s (visual check).
29. Open feed valve (7).

    Low-temperature circuit is filled.

    Low-temperature circuit is filled when control unit (3) shows 0.0 bar.

30. Open drain valve (8) if coolant is no longer suctioned.
31. Remove control unit (3) along with all connections and tester cap (2).
32. Correct coolant level in low-temperature circuit expansion reservoir (1).
33. Attach cap (1.1) to low-temperature circuit expansion reservoir (1).