Remove/Install Expansion Valve - AR83.30-P-5520MFA

Model 118, 177, 243, 247 

Fig 1: AC Expansion Valve Components Location - Model 118 (Shown On Model 177)

Courtesy of MERCEDES-BENZ USA

Shown on model 177 with engine 282.9 with code 228 

Courtesy of MERCEDES-BENZ USA

	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
	Risk of injury  caused by fingers being jammed or pinched when removing, installing or aligning hoods, doors, trunk lid/rear-end door or sliding roof.	No parts of the body or limbs should be within the operating area when the components are moving.	AS00.00-Z-0011-01A
	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
	Risk of injury  . Skin or eye injuries may result when handling hot or glowing objects.	Wear protective gloves, protective clothing and safety glasses, if necessary.	AS00.00-Z-0002-01A
	Risk of injury  caused by scraping or cutting body parts on sharp vehicle parts	Always wear protective gloves when working on or near sharp and non-deburred vehicle parts. Deburr repair panels.	AS00.00-Z-0017-01A
Notice	Protect air conditioning circuit and components from moisture when carrying out repair work		AH83.30-P-0005-01KOA
	Notes on handling refrigerant R134a		AH83.30-P-0003-01KOA
	Notes on handling refrigerant R1234yf		AH83.30-P-0003-02A
	Remove/install
1	Discharge air conditioning system.	Model 118, 177, 247 with engine 260, 282, 608, 654Model 118, 177, 247.7 with engine 139 Model 243 with engine 780	AR83.30-P-1760MFA
2	Remove on-board electrical system battery.	Model 118, 177, 247 with code B01 (48V technology)	AR54.10-P-1134MFI
		Model 118, 177, 247 except code B01 (48V technology)	AR54.10-P-0005MFA
		Model 243	AR54.10-P-0005EQA
3	Remove heat shield (1) from firewall.	Model 118, 177, 247 with engine 654	AR49.10-P-0001MFF
		Model 118, 177, 247 with engine 608	AR49.10-P-0001MFE
		Model 118, 177, 247 with engine 282	AR49.10-P-0001MFD
		Model 118, 177, 247 with engine 260	AR49.10-P-0001MFC
		Model 118, 177, 247.7 with engine 139	AR49.10-P-0001MFG
4	Remove nut (2) on firewall from auxiliary heating valve holder (3).	Model 118, 177, 247 with code 228 (Additional warm water heating)
5	Remove auxiliary heating valve holder (3) with auxiliary heating valve and place to one side.	Model 118, 177, 247 with code 228 (Additional warm water heating)
6	Remove nut (4) of refrigerant lines (5, 6).	Nut, refrigerant line to expansion valve	*BA83.30-P-1001-01T
7	Remove refrigerant lines (5, 6) and seal exposed openings with suitable stop plugs.
		: Replace sealing rings and moisten with compressor oil.	BB00.40-P-0362-01A
		Record plug	Fig 2
8	Remove screws (7).	Bolt, expansion valve to retaining plate	*BA83.30-P-1009-01T
9	Remove expansion valve (8) and seal exposed openings using suitable stop plugs
		: Replace sealing rings and moisten with compressor oil.	BB00.40-P-0362-01A
		Record plug	Fig 2
10	Install in the reverse order.
	Check
	Risk of accident  from vehicle starting off by itself when engine running. Risk of injury  (bruises and burns) resulting from working on the engine while it is being started or when it is running.	Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.	AS00.00-Z-0005-01A
11	Perform engine test run, check air conditioning system for proper operation and leak tightness.		AR83.30-P-1760MFA

Fig 2: Identifying Record Plug (129 589 00 91 00)

Courtesy of MERCEDES-BENZ USA