Remove/install heater for vehicle interior coolant circuit

AR83.70-D-0019TE

Remove/install heater for vehicle interior coolant circuit

27.11.2019

Model

910 with engine 780.703

1

Heater unit

5

High-voltage connector

9

Ground cable

2

Coolant expansion reservoir

6

Bracket

10

Coolant hoses

3

Bracket

7

Electrical lines

11

Bolts

4

Nuts

8

Electrical connector

 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 self-locking nuts and bolts

AH00.00-N-0001-01A

Topical note

General information on handling vehicles with high-voltage on-board electrical system and/or lithium-ion battery and/or gaseous-fuel drive system

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 ventilation box.

AR83.10-D-0010TS

2

Drain coolant of auxiliary circuit.

AR08.50-D-0022TE

3

De-energize high-voltage on-board electrical system.

AR47.70-D-1000TE

4

Remove coolant expansion reservoir (2) of main circuit.

AR08.50-D-0006TE

5

Remove holder (3) of coolant expansion reservoir (2).

 To do so, remove nuts (4).

 M5

*BA00.10-N-1001-01A

6

Remove high voltage line of high-voltage plug (5) from holder (6).

 Installation: Check retaining clips for damage.

 Clip remover

*452589016300

If any is found,



Replace damaged retaining clip.

7

Release and disconnect high-voltage plug (5).

8

Cover electrical connections with suitable protective covers.

 Set of protective covers

*001589019100

9

Remove electric lines (7) from holder (6).

 Installation: Check retaining clips for damage.

 Clip remover

*452589016300

If any is found,



Replace damaged retaining clips.

10

Disconnect electrical connector (8).

11

Detach ground line (9).

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

AR47.70-D-1020-01TE

 Installation: Check ground line (9).

 Nut, potential equalization ground line to vehicle interior heater

*BA47.70-N-1013-02TE

 Nut, potential equalization ground line to high-voltage components holder in engine compartment

*BA47.70-N-1008-02TE

12

Remove coolant hoses (10).

 Collect escaping coolant. Plug openings. Clamps are vulcanized onto coolant hoses (10).

 Installation: Note assignment of coolant hoses (10).

 Set of protective covers

*001589019100

 Hose clamp pliers

*454589003700

13

Remove screws (11).

 Screw, vehicle interior heater to vehicle interior heater holder

*BA83.70-N-1003-02TS

14

Remove heater (1).


Exercise caution when removing, taking out and inserting heater (1).
Otherwise, the heater (1) or adjacent component parts will be damaged.

15

Install in the reverse order.



Check

16

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

If heater (1) is replaced.



AD00.00-D-2000-06TS

 Headless screws/bolts: screws/bolts and nuts, coarse-pitch thread

Number

Designation

8.8

10.9

BA00.10-N-1001-01A

M5

Galvanized

Nm

6

8

Phosphated

Nm

5

7

 Headless screws/bolts: screws/bolts and nuts, coarse-pitch thread

Number

Designation

12.9

BA00.10-N-1001-01A

M5

Galvanized

Nm

9

Phosphated

Nm

9

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

Number

Designation

Engine 780.703 in model 910

BA47.70-N-1008-02TE

Nut, potential equalization ground line to high-voltage components holder in engine compartment

Nm

16

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

Number

Designation

Engine 780.703 in model 910

BA47.70-N-1013-02TE

Nut, potential equalization ground line to vehicle interior heater

Nm

7

 Heater booster unit

Number

Designation

Model 910 with engine 780.703

BA83.70-N-1003-02TS

Screw, vehicle interior heater to vehicle interior heater holder

Nm

7