Drain/fill coolant of main circuit

AR08.50-D-0023TE

Drain/fill coolant of main circuit

24.07.2020

Engine

780.703 in model 910

Modification notes

20.07.2020

Special tool 124 589 24 21 00 pressure pump added.

Operation step 22

20.07.2020

Method modified.

Operation steps 34, 38, 39, 40, 41, 42, 43

AR08.50-D-0017-01TE

20.07.2020

Special tool 124 589 24 21 00 pressure pump added.

Operation steps 38, 39, 41, 42

AR08.50-D-0017-01TE

1

Coolant expansion reservoir

4

Drain screw

6

Axle drive module

2

Cap

5

Radiator

7

Connection fitting

3

Hose

1

Coolant expansion reservoir

8

Tester cap

9

Pressure pump

 Danger

Risk of death when working on component parts and systems with U >= 30 V alternating voltage (AC) or U >= 60 V direct voltage (DC)

Do not touch damaged or defective live component parts and lines or non-insulated electrical connections and lines.

AS00.00-Z-0035-01A

 Warning

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 pressure. Do not pour coolant into beverage containers.
Wear protective gloves, protective clothing and safety glasses.

AS20.00-Z-0001-01A

Topical note

Notes on avoiding damage through contamination and foreign objects

AH00.00-P-5000-01A

Topical note

General information on vehicles with high-voltage on-board electrical system and/or lithium-ion battery and/or gaseous-fuel drive system as well as personal protective equipment

AH00.00-Z-0300-01A

Topical note

Notes on coolant

AH20.00-N-2080-01A

Notes on coolant level

AH20.00-P-1142-01CW

Drain off

1

Lock electric coolant pumps using vehicle diagnosis system.



Connect/disconnect diagnostic unit

AD00.00-D-2000-06TS


HVAC system must be deactivated (position 0).
Coolant pumps will otherwise be actuated in an unintended manner, which can cause malfunctions.

 Fully execute specified process.
To do so, select following menu items:
Powertrain (CPC) 
Actuations 
Locking of coolant pumps.

 Do not yet remove diagnostic system.

2

Remove cap (2) of coolant expansion reservoir (1).

 First unscrew cap (2) counterclockwise to first detent and release overpressure. Then remove cap (2).

3

Remove lower engine compartment lining

AR61.20-D-1105TS

4

Slide a suitable hose (3), as shown, onto fitting at coolant radiator (5).

5

Drain off coolant.

 For this purpose, open drain screw (4) and unscrew until coolant drains off. Fully drain and collect coolant. Do not yet screw in drain screw (4).

 Commercially available devices/tools
Collecting pan

6

Replace sealing ring at drain screw (4).

If drain screw (4) was leaky.

 Assembly tool

*000589936300

7

Lower vehicle.

8

Attach tester cap (8) to coolant expansion reservoir (1).

 Test cap

*210589009100

9

Attach pressure pump (9) to tester cap (8).

 Pressure pump

*124589242100

 Test cap

*210589009100

10

Generate pressure with pressure pump (9) until coolant no longer emerges.


Coolant radiator (5) must be as empty as possible.
Filling and subsequent bleeding can otherwise not be fully carried out, this can result in malfunctions and damage.

 Collect coolant.

 Commercially available devices/tools
Collecting pan

 Pressure pump

*124589242100

11

Raise vehicle.

12

Tighten drain screw (4).

 Drain screw to main circuit coolant radiator

*BA08.50-N-1001-01TE

13

Remove hose (3) from fitting at coolant radiator (5).

14

Remove connection fittings (7) from axle drive module (6) and drain off coolant.

AR08.50-P-0018-01EQ

 Fully collect escaping coolant.

 Commercially available devices/tools
Collecting pan

15

Lower vehicle.

16

Generate pressure with pressure pump (9) until coolant no longer emerges.


Coolant circuit of axle drive module (6) must be as empty as possible.
Filling and subsequent bleeding can otherwise not be fully carried out, this can result in malfunctions and damage.

 Collect coolant.

 Commercially available devices/tools
Collecting pan

 Pressure pump

*124589242100

17

Remove pressure pump (9) from tester cap (8).

 Pressure pump

*124589242100

 Test cap

*210589009100

18

Remove tester cap (8) from coolant expansion reservoir (1).

 Test cap

*210589009100

19

Raise vehicle.

20

Install connection fittings (7) at axle drive module (6).

AR08.50-P-0018-01EQ

21

Lower vehicle.

Pour in

22

Fill in coolant at coolant expansion reservoir (1).

AR08.50-D-0017-01TE


Main circuit must be as empty as possible for this purpose.
Filling and subsequent bleeding can otherwise not be fully carried out, this can result in malfunctions and damage.

 Filling capacity for cooling system

*BF08.50-N-1001-01TE

 Test cap

*210589009100

 Cooler vacuum filling device

*285589002100

 Electric vacuum pump

*285589022100

 NTKL Adaption

*285589012100

 Pressure pump

*124589242100

23

Connect charger to 12 volt on-board electrical system battery.

AR54.10-D-1127TS

 Bleeding of main circuit with vehicle diagnosis system takes approx. 15 min. A constant 12 volt power supply is required for this purpose.

24

Bleed main circuit.

AR08.50-D-0017-01TE


Observe specified procedure at all times.
Duration of bleed process can otherwise increase significantly.

 Electric coolant pumps are automatically released during the bleed process.
Fully execute specified process.

If the high-voltage on-board electrical system is no in operation:



Put the high-voltage on-board electrical system into operation.

AR47.70-D-1000TE

25

Remove vehicle diagnosis system.



Connect/disconnect diagnostic unit

AD00.00-D-2000-06TS

26

Remove charger from 12 volt on-board electrical system battery.

AR54.10-D-1127TS



Check

27

Check coolant level.

If necessary:



Correct coolant level.

 Filling capacity for cooling system

*BF08.50-N-1001-01TE

28

Check main circuit for leak tightness.

AR08.50-D-0013TE

 Cooling system

Number

Designation

Engine 780.703 in model 910

BA08.50-N-1001-01TE

Drain screw to main circuit coolant radiator

Nm

 3

 Cooling system

Number

Designation

Engine 780.703 in model 910

BF08.50-N-1001-01TE

Filling capacity for cooling system

Main circuit

l

 4,8

Auxiliary circuit with 3 high-voltage batteries

l

 9,6

Auxiliary circuit with 4 high-voltage batteries

l

 10,4

Main circuit and auxiliary circuit with 3 high-voltage batteries in repair case

l

 14,4

Main circuit and auxiliary circuit with 4 high-voltage batteries in repair case

l

 15,2

Mixing ratio for antifreeze/water (to -37 °C)

%

50/50

Coolant specifications

BB00.40-P-0310-01A

Specification

BB00.40-P-0325-05A