Remove/install auxiliary circuit heater

AR08.50-D-0032TE

Remove/install auxiliary circuit heater

13.01.2020

Engine

780.703 in model 910

1

Heater unit

5

High-voltage line

9

Electrical line

2

Coolant hoses

6

Bracket

10

Electrical connector

3

Nut

7

High-voltage plug

11

Bolts

4

Ground cable

8

High-voltage plug

 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

Information on preventing damage to electronic components due to electrostatic discharge

AH54.00-P-0001-01A

Topical note

Notes on battery

AH54.10-P-0001-01A

 

Remove/install

1

Remove switchover valve at underbody and place to one side.

AR08.50-D-0031TE

 In this connection, coolant of auxiliary circuit is already drained.

2

Remove voltage of high-voltage on-board electrical system.

AR47.70-D-1000TE

3

Remove coolant hoses (2) from heater (1).

 Collect escaping coolant.
Plug openings.

 Record plug

*129589009100

 Hose clamp pliers

*454589003700

4

Remove ground line (4) at heater (1).

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

AR47.70-D-1020-01TE

Topical note

Notes on self-locking nuts and bolts

AH00.00-N-0001-01A

 For this purpose, remove nut (3).

 Installation: Check ground line (4).

 Nut, potential equalization ground line to auxiliary circuit heater holder

*BA47.70-N-1011-02TE

 Nut, potential equalization ground line to auxiliary circuit heater holder

*BA47.70-N-1011-02TE

5

Remove high voltage line (5) from bracket (6).

 Installation: Check retaining clips for damage.

 Clip remover

*452589016300

Depending on the findings,



Replace damaged retaining clip.

6

Release and disconnect high-voltage plug (7) at high-voltage power distributor.

 WIS Service Media
wsm://04_ 201800_30

7

Remove high voltage line (5).

 For this purpose, release and disconnect high-voltage plug (8) at heater (1).

8

Cover high-voltage connections at heater (1) and at high-voltage power distributor at underbody with suitable protective covers.

 Set of protective covers

*001589019100

9

Remove electric line (9) from bracket (6).

 Installation: Check retaining clips for damage.

 Clip remover

*452589016300

Depending on the findings,



Replace damaged retaining clip.

10

Disconnect electrical connector (10).

11

Remove bracket (6).

 Bolt, holder to high-voltage power distributor/holder

*BA47.70-N-1006-03TE

12

Remove screws (11).

 Screw, auxiliary circuit heater to holder

*BA08.50-N-1004-01TE

13

Remove heater (1).


Carefully detach, remove and insert heater (1).
Heater (1) and/or adjacent component parts can otherwise be damaged.

14

Install in the reverse order.



Check

15

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

If heater (1) will be replaced.



AD00.00-D-2000-06TS

 Cooling system

Number

Designation

Engine 780.703 in model 910

BA08.50-N-1004-01TE

Screw, auxiliary circuit heater to holder

Nm

7

 High-voltage power distributor

Number

Designation

Engine 780.703 in model 910

BA47.70-N-1006-03TE

Bolt, holder to high-voltage power distributor/holder

Nm

8

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

Number

Designation

Engine 780.703 in model 910

BA47.70-N-1011-02TE

Nut, potential equalization ground line to auxiliary circuit heater holder

Nm

7