Remove/install expansion valve

AR83.30-P-5520V

Remove/install expansion valve

02.07.2019

Model

171.4, 172.4

with code 580 (Air-conditioning system)

Model

171.4, 172.4

with code 581 (Automatic air conditioning)

Modification notes

16.03.2017

"Technical note" added

AH83.30-P-0005-01A

05.10.2016

Safety note added

AS83.00-Z-0006-01A

30.09.2016

Safety note added

AS83.00-Z-0007-01A

30.09.2016

General note added

AH83.30-P-0003-02A

Shown on model 171.4

1

Expansion valve

2

Nut

3

Low pressure pipe

4

Nut

5

High pressure pipe

6

Bolts

7

Sealing rings

8

Connection fitting

 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.

AS83.00-Z-0006-01A

 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

Topical note

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

AH83.30-N-0005-01A

Topical note

Procedure for a damaged or leaky air conditioning system

AH83.30-N-0004-01A

Notes on handling refrigerant R1234yf

AH83.30-P-0003-02A

Notes on handling refrigerant R134a

AH83.30-N-0003-01A



Remove

1

Drain air conditioning system

AR83.30-P-1760V

2

Release holder of refrigerant line from left suspension strut tower

Model 172.4
with code 580 (Air-conditioning system)
Model 172.4
with code 581 (Automatic air conditioning)

3

Unscrew nut (2) and pull off low-pressure line (3)

4

Seal opening of low-pressure line (3) and at expansion valve (1) using suitable stop plugs


The openings of the low pressure line (3) and on the expansion valve (1) must be sealed.
Otherwise, penetrating dirt and moisture will damage the air conditioning system.

 Record plug

*129589009100

5

Unscrew nut (4) and pull off high-pressure line (5) from expansion valve (1)

6

Seal openings of high-pressure line (5) and expansion valve (1) using suitable stop plugs


The openings of the high pressure line (5) and on the expansion valve (1) must be sealed.
Otherwise, penetrating dirt and moisture will damage the air conditioning system.

 Record plug

*129589009100

7

Remove screws (6) and remove expansion valve (1)

8

Seal openings of connection fitting (8) using suitable stop plugs


The openings of the connection fitting (8) must be sealed.
Otherwise, penetrating dirt and moisture will damage the air conditioning system.

 Record plug

*129589009100



Install

9

Fit expansion valve (1) and tighten screws/bolts (6)



Compressor oils (specification 362.1)

BB00.40-P-0362-01A


The screws (6) must be screwed-in alternately.
This is to prevent the expansion valve (1) from being tilted on the connection fitting (8).

 The thread of the screws (6) must be moistened with compressor oil.

 Sealing rings (7) on connection fitting (8) must be replaced and moistened with compressor oil.
If the thread of the screws (6) fails to grip, the threaded plate must be pulled forward using an extraction hook.

 Bolt, expansion valve

*BA83.30-P-1002-01D

 Extraction hook

*140589023300

10

Fit high-pressure line (5) and tighten nut (4)



Compressor oils (specification 362.1)

BB00.40-P-0362-01A

 The sealing ring of the high-pressure line (5) must be replaced and moistened with compressor oil.

 Nut, high-pressure line to expansion valve

*BA83.30-P-1012-01D

11

Fit low-pressure line (3) and tighten nut (2)



Compressor oils (specification 362.1)

BB00.40-P-0362-01A

 The sealing ring of the low-pressure line (3) must be replaced and moistened with compressor oil.

 Nut, low-pressure line to high-pressure line

*BA83.30-P-1011-01D

12

Attach holder of refrigerant line to left suspension strut tower

Model 172.4
with code 580 (Air-conditioning system)
Model 172.4
with code 581 (Automatic air conditioning)

Check

13

Evacuate air conditioning system, refill it, and then check the system to make sure that it functions correctly and does not leak

AR83.30-P-1760V

 Air conditioning

Number

Designation

Model 171 (except 171.473)

Model 171.473

BA83.30-P-1002-01D

Bolt, expansion valve

Nm

4

4

 Air conditioning

Number

Designation

Model 172

BA83.30-P-1002-01D

Bolt, expansion valve

Nm

5

 Air conditioning

Number

Designation

Model 171 (except 171.473)

Model 171.473

BA83.30-P-1011-01D

Nut, low-pressure line to high-pressure line

Nm

8

8

 Air conditioning

Number

Designation

Model 172

BA83.30-P-1011-01D

Nut, low-pressure line to high-pressure line

Nm

8

 Air conditioning

Number

Designation

Model 171 (except 171.473)

Model 171.473

BA83.30-P-1012-01D

Nut, high-pressure line to expansion valve

Nm

8

8

 Air conditioning

Number

Designation

Model 172

BA83.30-P-1012-01D

Nut, high-pressure line to expansion valve

Nm

8