Remove/install auxiliary circuit heater

AR08.50-S-0032G

Remove/install auxiliary circuit heater

10.03.2020

Engine

780.702 in model 447

2

Vertical carrier

3

Nuts

4

Nut

1

Heater unit

11

Ground cable

5

Bolts

12

Nut

6

Bracket

13

Electrical connector

7

Screw

14

High-voltage line

8

High-voltage lines

15

High-voltage plug

9

Coolant hose

16

Line bracket

10

Coolant hose

 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

 Caution

Risk of injury caused by scraping or cutting body parts on sharp vehicle parts

Always wear protective gloves when working on or near sharp and non-deburred vehicle parts.
Deburr repair panels.

AS00.00-Z-0017-01A

Topical note

Notes on battery

AH54.10-P-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

Information on preventing damage to electronic components due to electrostatic discharge

AH54.00-P-0001-01A

 

Remove/install

1

Remove AC charger for high-voltage battery.

AR47.70-S-1511G

2

Remove vertical carrier (2) of the assembly carrier.

 To do this, remove nuts (3, 4).

 Nut, vertical carrier to assembly carrier/tubular frame

*BA47.00-N-0003-01F

3

Remove bolts (5).

 Lay down heater (1) in the working area under the assembly carrier.

 Screw, coolant circuit heater to holder

*BA08.50-N-1001-03F

4

Drain coolant for high-voltage battery cooling system.

AR08.50-S-0022G

5

Remove integral carrier.

AR31.35-S-0001G

6

Remove holder (6).

 Remove bolt (7) to do this.

7

Remove bracket (6).

 To do this, remove high-voltage lines (8).

 Installation: Check retaining clips for damage.

If damage exists,



replace damaged retaining clips.

8

Remove coolant hoses (9, 10).

 Seal connections. Collect coolant which flows out.

 Commercially available devices/tools
Collecting pan

 Set of protective covers

*001589019100

 Hose clamp pliers

*454589003700

9

Remove ground line (11).

Check ground lines for high-voltage on-board electrical system potential equalization

AR47.70-S-1020-01G

 To do this, remove nut (12).

 Installation: Check ground line (11).

 Nut, potential equalization ground line to coolant circuit heater for high-voltage battery

*BA47.70-N-1009-02F

 Nut, potential equalization ground line to bracket for charger, DC/DC converter, heater

*BA47.70-N-1007-02F

10

Disconnect electrical connector (13).

11

Remove high-voltage line (14) from the line bracket (16).

 Installation: Check retaining clips for damage.

 Clip remover

*452589016300

If damage exists,



Replace retaining clip.

12

Release and disconnect high-voltage plug (15).

13

Cover high-voltage connections with suitable protective covers.

 Set of protective covers

*001589019100

14

Remove heater (1).

15

Install in the reverse order.

16

Perform commissioning of heater (1) with vehicle diagnosis system.

If a new heater (1) was installed.



Connect STAR DIAGNOSIS and read out fault memory

AD00.00-S-2000-04E

 Heater of high-voltage battery cooling system

Number

Designation

Engine 780.701/702 in model 447

BA08.50-N-1001-03F

Screw, coolant circuit heater to holder

Nm

7

 Assembly carrier

Number

Designation

Engine 780.701/702 in model 447

BA47.00-N-0003-01F

Nut, vertical carrier to assembly carrier/tubular frame

Nm

23

 High-voltage on-board electrical system potential equalization ground lines

Number

Designation

Engine 780.702 in model 447

BA47.70-N-1007-02F

Nut, potential equalization ground line to bracket for charger, DC/DC converter, heater

Nm

16

 High-voltage on-board electrical system potential equalization ground lines

Number

Designation

Engine 780.702 in model 447

BA47.70-N-1009-02F

Nut, potential equalization ground line to coolant circuit heater for high-voltage battery

Nm

7