Drain/fill coolant of auxiliary circuit

AR08.50-S-0022G

Drain/fill coolant of auxiliary circuit

24.07.2020

Engine

780.702 in model 447

Modification notes

20.07.2020

Special tool 124 589 24 21 00 (pressure pump) added.

Operation step 28

20.07.2020

Method modified.

Operation steps 36, 40, 41, 42, 43, 44, 45

AR08.50-S-0017-01F

20.07.2020

Special tool 124 589 24 21 00 (pressure pump) added.

Operation steps 40, 41, 43, 44

AR08.50-S-0017-01F

1

Cap

2

Coolant expansion reservoir

7

Coolant hose line

8

Cooler

18

Coolant hose line

19

Coolant hose line

20

High-voltage battery

2

Coolant expansion reservoir

16

Tester cap

17

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

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 avoiding damage through contamination and foreign objects

AH00.00-P-5000-01A

Topical note

Notes on coolant

AH20.00-N-2080-01A

Topical note

Notes on battery

AH54.10-P-0001-01A

Notes on coolant level for high-voltage battery cooling system

AH08.50-S-0051-01F

Drain off

1

Lock electric coolant pumps using vehicle diagnosis system.



Connect STAR DIAGNOSIS and read out fault memory

AD00.00-S-2000-04E


The heating, cooling and ventilation system must be switched off (position 0).
Otherwise, electric coolant pumps will be actuated unintentionally, which can result in malfunctions.

 Work through specified procedure completely.
To do so, select following menu items:
Powertrain (CPC) 
Actuations 
Locking of coolant pumps.

 Do not yet remove vehicle diagnosis system.

2

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

 First unscrew cap (1) counterclockwise up to the safety catch and release overpressure. Then remove cap (1).

3

Remove front bumper.

AR88.20-S-2000E

4

Remove bottom engine compartment lining.

AR61.20-S-1105E

5

Remove coolant hose line (7) from cooler (8) and drain coolant.

AR20.20-P-7441-01RQ

 Collect coolant.
Commercially available devices/tools
Collecting pan

6

Lower vehicle.

7

Attach tester cap (16) to coolant expansion reservoir (2).

 Test cap

*210589009100

8

Attach pressure pump (17) to tester cap (16).

 Pressure pump

*124589242100

 Test cap

*210589009100

9

Use pressure pump (17) to generate pressure until coolant no longer escapes.


The cooler (8) must be as empty as possible.
Otherwise, filling and later ventilation cannot be performed completely, which can lead to malfunctions and damage.

 Collect coolant.
Commercially available devices/tools
Collecting pan

 Pressure pump

*124589242100

10

Raise vehicle.

11

Reattach coolant hose line (7) to cooler (8).

AR20.20-P-7441-01RQ

12

Install front bumper.

If no additional work is required in this area.

AR88.20-S-2000E

13

Remove cross strut.

AR61.10-S-5139F

14

Remove coolant hose line (18) from connection fitting at high-voltage battery (20) and drain coolant.

AR20.20-P-7441-01RQ

 Collect coolant.
Commercially available devices/tools
Collecting pan

15

Lower vehicle.

16

Use pressure pump (17) to generate pressure until coolant no longer escapes.


The coolant circuit must be as empty as possible.
Otherwise, filling and later ventilation cannot be performed completely, which can lead to malfunctions and damage.

 Collect coolant.
Commercially available devices/tools
Collecting pan

 Pressure pump

*124589242100

17

Raise vehicle.

18

Reinstall coolant hose line (18) at connection fitting of high-voltage battery (20).

AR20.20-P-7441-01RQ

19

Remove coolant hose line (19) from connection fitting of high-voltage battery (20) and drain coolant.

AR20.20-P-7441-01RQ

 Collect coolant.
Commercially available devices/tools
Collecting pan

20

Lower vehicle.

21

Use pressure pump (17) to generate pressure until coolant no longer escapes.


The coolant circuit must be as empty as possible.
Otherwise, filling and later ventilation cannot be performed completely, which can lead to malfunctions and damage.

 Collect coolant.
Commercially available devices/tools
Collecting pan

 Pressure pump

*124589242100

22

Raise vehicle.

23

Reinstall coolant hose line (19) at connection fitting of high-voltage battery (20).

AR20.20-P-7441-01RQ

24

Install cross strut.

AR61.10-S-5139F

25

Remove pressure pump (17).

 Pressure pump

*124589242100

Pour in

26

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

If the high-voltage on-board electrical system is not in operation.

AR47.70-S-1000G

27

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

AR54.10-S-1127E

 The filling and bleeding of the coolant circuit with the diagnostic system takes some time; for this purpose, a constant 12 volt power supply is required.

28

Pour coolant into coolant circuit of the high-voltage battery (20).

AR08.50-S-0017-01F


The coolant circuit must be as empty as possible before filling.
Filling and ventilation can otherwise not be fully carried out, something which can result in malfunctions and damage.

 Evacuate coolant circuit, check, and fill.

 Electric drive cooling system

*BF08.50-N-1001-01F

 Test cap

*210589009100

 Cooler vacuum filling device

*285589002100

 NTKL Adaption

*285589012100

 Electric vacuum pump

*285589022100

 Pressure pump

*124589242100

29

Bleed coolant circuit for high-voltage battery (20) using diagnostic system.



Connect STAR DIAGNOSIS and read out fault memory

AD00.00-S-2000-04E

AR08.50-S-0017-01F

 The coolant pumps are released automatically when they are bled.
Work through specified procedure completely.
To do so, select following menu items:
Powertrain (CPC) 
Special procedures 
Bleeding of passenger compartment high-voltage battery coolant circuit

 The duration of the bleeding process for the cooling circuit of the high-voltage battery (20) is approx. 30 min.

30

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

AR54.10-S-1127E



Check

31

Check coolant level of coolant circuit of high-voltage battery (20).

If coolant level incorrect



Correct coolant level.

 Electric drive cooling system

*BF08.50-N-1001-01F

32

Check coolant circuit of high-voltage battery (20) for leaks.

AR08.50-S-0011F

 Reinstall lower engine compartment lining after leak test.

 Cooling system

Number

Designation

Engine 780.701/702 in model 447

BF08.50-N-1001-01F

Electric drive cooling system

Cooling system of high-voltage battery and vehicle interior

Filling capacity

Liter

 10

Cooling system of electric motor

Filling capacity

Liter

 5

For both cooling systems, entire filling capacity, in the workshop

Filling capacity

Liter

 15

Antifreeze/water

Down to -37 °C

%

50/50

Coolant specifications

BB00.40-P-0310-01A

Sheet

BB00.40-P-0325-05A