Remove and install expansion valve - AR83.30-P-5520V

MODEL 171.4 with CODE (580) Automatic air conditioning with CODE (581) Convenience automatic air conditioning

Fig 1: Identifying Expansion Valve Components

Courtesy of MERCEDES-BENZ USA

	Remove
	Risk of explosion caused by welding or soldering work on closed air conditioning system. Risk of poisoning caused by inhaling overheated refrigerant vapors. Risk of injury to skin and eyes caused by contact with liquid refrigerant.	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 areas. Carry out repair work on the air conditioning system circuit only after the system has been discharged.	-
	Conduct if air conditioning system is damaged or leaking		AH83.30-N-0004-01A
	Protect air conditioning circuit and components from moisture when carrying out repair work		-
	Notes on handling refrigerant R134a		AH83.30-N-0003-01A
1	Discharge air conditioning system		AR83.30-P-1760V
2	Unscrew nuts (2)
3	Detach low-pressure line (3) and seal off opening in low-pressure line (3) using a suitable cap	The opening in the low-pressure line (3) must be sealed, otherwise the ingress of dirt and moisture will damage the components connected to the refrigerant circuit.
			*WH58.30-Z-1002-27A
4	Unscrew nut (4)
5	Detach high-pressure line (5) from expansion valve (1)
6	Seal off openings in high-pressure line (5) and in expansion valve (1) using a suitable cap or a suitable stop plug	The opening in the high-pressure line (5) and the openings in the expansion valve (1) must be sealed, otherwise the ingress of dirt and moisture will damage the components connected to the refrigerant circuit.
			*WH58.30-Z-1002-27A
7	Remove bolts (6).
8	Remove expansion valve (1)
9	Seal connecting pipes (8) using suitable caps	The connecting pipes (8) must be sealed, otherwise the ingress of dirt and moisture will damage the components connected to the refrigerant circuit.
			*WH58.30-Z-1002-27A
	Install
10	Remove caps, replace sealing rings (7) and moisten with compressor oil
			*WH58.30-Z-1002-27A
11	Remove stop plug and position expansion valve (1)		*WH58.30-Z-1002-27A
12	Moisten screws (6) with compressor oil and screw in	If the thread of the screws (6) does not grip, pull tapping plate forward using pulling hook, hold and screw in screws (6). Screw in screws (6) alternately to prevent the expansion valve (1) from tilting on the connecting pipes (8).
			*BA83.30-P-1002-01D
			Figure
13	Remove cap and replace sealing ring of high-pressure line (5)	Moisten sealing ring of high-pressure line (5) with compressor oil.
			*WH58.30-Z-1002-27A
14	Position high-pressure line (5)
15	Tighten nut (4)		*BA83.30-P-1012-01D
16	Remove cap and replace sealing ring of low-pressure line (3)	Moisten sealing ring of low-pressure line (3) with compressor oil.
			*WH58.30-Z-1002-27A
17	Position low-pressure line (3)
18	Tighten nut (2)		*BA83.30-P-1011-01D
19	Evacuate the 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 SYSTEM

Number	Designation		Model 171 except 171.473	Model 171.473
BA83.30-P-1002-01D	Bolt of expansion valve	Nm	4	4
BA83.30-P-1011-01D	Nut for low-pressure line to high-pressure line	Nm	8	8
BA83.30-P-1012-01D	Nut for high-pressure line to expansion valve	Nm	8	8

COMMERCIALLY AVAILABLE TOOLS

Number	Designation
WH58.30-Z-1002-27A	Set of plugs for air conditioning system	140 830 01 27

Fig 2: Identifying Pulling Hook (140 589 02 33 00)

Courtesy of MERCEDES-BENZ USA