Remove/install heat exchanger of high-voltage battery cooling system in engine compartment

AR08.50-S-0300F

Remove/install heat exchanger of high-voltage battery cooling system in engine compartment

13.02.2020

Engine

780.701/702 in model 447

Shown with engine 780.701

1

Heat exchanger

Shown with engine 780.701

1

Heat exchanger

5

Nut

8

Refrigerant line

2

Expansion valve

6

Refrigerant line

9

Coolant hose lines

3

Electrical connector

7

Nut

10

Bolts

4

Electrical connector

Shown on removed heat exchanger (1)

1

Heat exchanger

2

Expansion valve

 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

 Danger

Risk of fire due to ignition of R1234yf refrigerant on hot components. Risk of poisoning caused by inhaling overheated refrigerant vapors. Risk of injury to skin and eyes caused by contact with escaped R1234yf refrigerant and when working on pressurized parts. Risk of explosion due to formation of ignitable refrigerant/air mixtures

Never perform welding work on or near a closed air conditioning system. No smoking or open flames. Wear safety glasses and protective gloves. Work only in well ventilated rooms. Carry out repair work on the air conditioning system circuit only after the system has been evacuated.

AS83.00-Z-0007-01A

 Warning

Risk of poisoning caused by inhaling overheated refrigerant vapors from an air conditioning system containing R134a. Risk of injury to skin and eyes caused by contact with liquid R134a refrigerant and when working on pressurized parts

Never perform welding work on or near a closed air conditioning system. No smoking or open flames. Wear safety glasses and protective gloves. Work only in well ventilated rooms. Carry out repair work on the air conditioning system circuit only after the system has been evacuated.Engine 780.701 in model 447

AS83.00-Z-0006-01A

 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

Procedure for a damaged or leaky air conditioning system

AH83.30-N-0004-01A

Topical note

Protect air conditioning circuit and components from moisture when carrying out repair work

AH83.30-N-0005-01A

Notes on handling refrigerant R1234yf

AH83.30-P-0003-02A

Notes on handling refrigerant R134a

Engine 780.701 in model 447

AH83.30-N-0003-01A

 

Remove/install

1

Drain refrigerant circuit.

Engine 780.701 in model 447
except code HX1 (Refrigerant R-1234yf)
Engine 780.701/702 in model 447
with code HX1 (Refrigerant R-1234yf)

AR08.50-S-8001F

2

Drain coolant of high-voltage battery cooling system.

Engine 780.701 in model 447

AR08.50-S-0021F

Engine 780.702 in model 447

AR08.50-S-0022G

3

Switch off ignition and store transmitter key outside of transmission range (min. 2  m).

4

Disconnect electrical connectors (3, 4).

5

Remove nut (5) of refrigerant line (6).

 Nut, refrigerant line to expansion valve for high-voltage battery

*BA08.50-N-1001-02F

6

Remove refrigerant line (6) at expansion valve (2).



Compressor oils (specification 362.1)

BB00.40-P-0362-01A

 Plug openings.

 Installation: Install new sealing ring and coat with compressor oil.

 Record plug

*129589009100

7

Remove nut (7) of refrigerant line (8).

 Nut, refrigerant line to expansion valve for high-voltage battery

*BA08.50-N-1001-02F

8

Remove refrigerant line (8) at expansion valve (2).



Compressor oils (specification 362.1)

BB00.40-P-0362-01A

 Plug openings.

 Installation: Install new sealing ring and coat with compressor oil.

 Record plug

*129589009100

9

Remove coolant hose lines (9) at heat exchanger (1).

AR20.20-P-7441-01RQ

 Collect escaping coolant using suitable vessel.
Plug openings.

 Set of protective covers

*001589019100

10

Remove screws (10).

 Bolt, heat exchanger of high-voltage battery cooling system to holder

*BA08.50-N-1003-01F

11

Remove heat exchanger (1) with attached expansion valve (2) and pressure and temperature sensor.

 The heat exchanger (1) is delivered as a replacement part with expansion valve (2) and pressure and temperature sensor.

12

Install in the reverse order.

 Refrigerant circuit of cooling system

Number

Designation

Model 447 with engine 780.701/702 with code HH9,
Model 447 with engine 780.702 with code HH4

BA08.50-N-1001-02F

Nut, refrigerant line to expansion valve for high-voltage battery

Nm

12

 Cooling system

Number

Designation

Engine 780.701/702 in model 447

BA08.50-N-1003-01F

Bolt, heat exchanger of high-voltage battery cooling system to holder

Nm

20