Remove/install air conditioner housing - AR83.30-P-5200MCU

MODEL 451.3## (except 451.39) 1#, 451.4## (except 451.49) 1# 

with CODE 494 (US version) 

with CODE I01 (Air conditioning Plus) 

Fig 1: Identifying Air Conditioner Housing Remove/Install Components (1 Of 3)

Courtesy of MERCEDES-BENZ USA

Fig 2: Identifying Air Conditioner Housing Remove/Install Components (2 Of 3)

Courtesy of MERCEDES-BENZ USA

Fig 3: Identifying Air Conditioner Housing Remove/Install Components (3 Of 3)

Courtesy of MERCEDES-BENZ USA

	Remove/install
	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.	Do not 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 drained.	AS83.00-Z-0001-01A
	Procedure for a damaged or leaky air conditioning system		AH83.30-N-0004-01A
	Protect air conditioning circuit and components from moisture when carrying out repair work		AH83.30-N-0005-01A
	Notes on handling refrigerant R134a		AH83.30-N-0003-01A
1	Remove front CBS		AR88.00-P-1010MCC
2	Drain air conditioning system	Evacuate air conditioning and then fill it.	AR83.30-P-1760MCC
3	Disconnect fully automatic air conditioning service station
	000 588 04 82 00 Air conditioning service unit		WS83.00-P-0031B
4	Remove front module		AR62.30-P-1575MCU
5	Drain coolant		AR20.00-P-1142MCU
6	Unclip hydraulic fluid reservoir (8) in the area marked (arrow) using a suitable screwdriver (7) and place to one side
7	Disconnect electrical connection (6) from refrigerant pressure sensor (B12)
8	Unscrew nut (2)	Nut, refrigerant lines to expansion valve	*BA83.30-P-1004-01L
9	Pull out refrigerant lines (3) at expansion valve (1) and remove seal rings of refrigerant lines (3)	Seal refrigerant lines (3) and expansion valve (1) with suitable stop plugs. Otherwise, ingressing dirt and moisture damage components that are connected to the refrigerant circuit. Replace sealing rings on refrigerant lines (3) and wet with compressor oil when inserting.
10	Loosen click clamps (5) on coolant hoses (4) and detach coolant hoses (4)	Collect any escaping coolant in a suitable container.
11	Remove crossmember below dashboard		AR62.30-P-1250MCU
12	Disconnect heating or A/C electrical connector (X85/10)
13	Remove retaining clip at right front floor covering (22) and place right front floor covering (22) in area of air conditioner housing (13) to one side
14	Detach drain hose (23) from air conditioner housing (13)	Ensure that drain hose (23) is correctly aligned and engaged at connection of air conditioner housing (13).
15	Unclip retaining clip (20) of main wiring harness (21) at air conditioner housing (13)
16	Place left front floor covering (22) in area of air conditioner housing (13) to one side
17	Unscrew nuts (9) from air conditioner housing (13)
18	Remove air conditioner housing (13) from vehicle	Make sure that the vehicle interior is not soiled by escaping coolant. Contaminated parts must be cleaned or replaced.
19	Disconnect electrical connector (19) from air recirculation flap actuator motor (M39)	When replacing the air conditioner housing (13).
20	Detach air recirculation unit (18) from air conditioner housing (13) by twisting and remove	When replacing the air conditioner housing (13).
21	Disconnect electrical connection (14), unscrew bolts (15) and remove blend air flap actuator (M16/8)	When replacing the air conditioner housing (13). Counterhold driver shaft on opposite side of air conditioner housing (13).
22	Disconnect electrical connection (16) and pull evaporator temperature sensor (B10/6) out of air conditioner housing (13)	When replacing the air conditioner housing (13).
23	Disconnect electrical connection (11), release lock (10) and loosen blower motor (M2) by turning counterclockwise and pull out of air conditioner housing (13)	When replacing the air conditioner housing (13).
24	Disconnect electrical connection (12) and release blower motor series resistor group (R14) by twisting clockwise and remove	When replacing the air conditioner housing (13).
25	Detach air conditioner housing wiring harness (17) from air conditioner housing (13) and remove	When replacing the air conditioner housing (13).
26	Remove heat exchanger	When replacing the air conditioner housing (13).	AR83.20-P-1100MCU
27	Replace activated charcoal fine particle filter	When replacing the air conditioner housing (13).
			AP83.00-P-8384MCC
28	Install in the reverse order