Remove/install AC housing - AR83.30-P-5200V

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

Fig 1: Identifying AC Housing Components (1 Of 2)

Courtesy of MERCEDES-BENZ USA

Fig 2: Identifying AC Housing Components (2 Of 2)

Courtesy of MERCEDES-BENZ USA

Shown with Automatic air conditioning, Code 580 

Fig 3: Identifying AC Housing Components - Shown With Automatic Air Conditioning, Code 580

Courtesy of MERCEDES-BENZ USA

	Remove/install
	Risk of explosion  from welding or soldering work on sealed air conditioning system. Risk of poisoning  from 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.
	Protect air conditioning circuit and components from moisture when carrying out repair work	All models fitted with air conditioning
	Notes on handling refrigerant R134a	Air conditioning system with refrigerant R134a	AH83.30-N-0003-01A
1	Drain coolant from radiator	Model 171.442	AR20.00-P-1142V
		Model 171.456	AR20.00-P-1142VA
		Model 171.473	AR20.00-P-1142PV
2	Discharge air conditioning system	Installation:  Evacuate, refill air conditioning system and check for proper operation and tightness.	AR83.30-P-1760V
3.1	Remove water collector	Model 171.442	AR83.25-P-1402V
3.2	Remove air cleaner housing	Models 171.454/456	AR09.10-P-1150VA
		Model 171.473	AR09.10-P-1150AC
4	Unscrew nuts (2)		*BA83.30-P-1011-01D
5	Detach low-pressure line (3)	Installation:  Renew sealing ring of low-pressure line (3) and wet with compressor oil.
6	Seal the low-pressure line opening (3) using a suitable sealing cap	The opening of the low-pressure line (3) must be sealed, as otherwise penetrating dirt and moisture can damage the components connected to the refrigerant circuit.
		Set of sealing caps for air conditioning system	*WH58.30-Z-1002-27A
7	Unscrew nut (4)		*BA83.30-P-1012-01D
8	Detach high pressure line (5) from expansion valve (6)	Installation:  Renew sealing ring of high-pressure line (5) and wet with compressor oil.
9	Use suitable sealing caps or plugs to seal opening of high pressure line (5) and openings of expansion valve (6)	The high pressure line (5) opening and the expansion valve (6) openings must be sealed, since otherwise any penetrating dirt and moisture can damage components connected to the refrigerant circuit.
		Set of sealing plugs for air conditioning system	*WH58.30-Z-1002-27A
10	Release clamp (7) and disconnect heating water feed device (8)	Collect escaping coolant.
11	Seal connecting pipe of heater water feed device distributor (8) at AC housing (1) with suitable sealing cap	This helps to prevent the interior of the vehicle from being soiled when the AC housing (1) is removed.
12	Detach hose clamps (9) and detach heater water return hoses (10)	Collect escaping coolant.
		Hose clamp pliers	*WH58.30-Z-1020-02A
13	Seal the connecting pipe of the heater water return hoses (10) on the AC housing (1) using suitable sealing caps	This helps to prevent the interior of the vehicle from being soiled when the AC housing (1) is removed.
14	Remove instrument panel carrier		AR68.10-P-1111V
15	Unplug electrical connector (11) from blower regulator
16	Release locking hook (14) on plug (12), slide plug (12) down and remove
17	Remove condensation water drain hoses (13) from AC housing (1) connecting pipe	Installation:  Wet the connecting pipe of the condensation water drain hoses (13) on the AC housing (1) using a lubricating fluid. Check the condensation water drain hoses (13) are correctly seated on the AC housing connecting pipes (1).
		Antifriction agent	*BR00.45-Z-1010-06A
18	Remove AC housing (1) toward rear with assistant and remove from vehicle interior	When removing or installing the vehicle's AC housing (1) always do so with an assistant, in order to avoid any damage to the interior and the AC housing (1). Installation:  Coat seals (15, 16) with liquid lubricant. Grease receptacles (18).
		Long-life grease	*BR00.45-Z-1001-06A
		Antifriction agent	*BR00.45-Z-1010-06A
19	Check seals (15, 16, 20) and gaskets (17) for signs of wear; replace if necessary
20.1	Undo screws (19) and expansion valve (6) as well as any concealed retaining plate	When replacing the seal (16). Installation:  Tighten screws (19) alternately, since the expansion valve (6) will otherwise be tilted on the connecting pipe. Installation:  Replace sealing rings of connecting pipes of expansion valve (6) and wet with compressor oil.
			*BA83.30-P-1002-01D
21.1	Remove seals (15, 20) and gaskets (17)	When replacing seals (15, 20) and gaskets (17).
22	Install in the reverse order
23	Synchronize the actuator motors	Menu option, Actuation, Normalization of actuator motors
	Connect STAR DIAGNOSIS, read out fault memory		AD00.00-P-2000-04A
		Diagnosis system STAR DIAGNOSIS	*WH58.30-Z-1048-13A