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

MODEL 117, 156, 176, 242, 246 

Shown with CODE 581 (Comfort automatic air conditioning) except CODE 228 (Stationary heater) 

Fig 1: Air Conditioner Housing Remove/Install Components - Shown With Code 581

Courtesy of MERCEDES-BENZ USA

Shown on MODEL 242.980 

Fig 2: Air Conditioner Housing Remove/Install Components - Shown On Model 242.980

Courtesy of MERCEDES-BENZ USA

Shown on model 246 

Fig 3: Air Conditioner Housing Remove/Install Components - Shown On Model 246 (1 Of 3)

Courtesy of MERCEDES-BENZ USA

Fig 4: Air Conditioner Housing Remove/Install Components - Shown On Model 246 (2 Of 3)

Courtesy of MERCEDES-BENZ USA

Fig 5: Air Conditioner Housing Remove/Install Components - Shown On Model 246 (3 Of 3)

Courtesy of MERCEDES-BENZ USA

Fig 6: Identifying Air Conditioner Housing Remove/Install Components

Courtesy of MERCEDES-BENZ USA

	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
	Risk of injury  to skin and eyes suffering scalding from contact with hot coolant spray. Risk of poisoning  from swallowing coolant.	Do not open cooling system unless coolant temperature is below 90 °C. Open cap slowly and release the pressure. Do not pour coolant into beverage containers. Wear protective gloves, protective clothing and safety glasses.	AS20.00-Z-0001-01A
	Protect air conditioning circuit and components from moisture when carrying out repair work		AH83.30-P-0005-01A
	Procedure for a damaged or leaky air conditioning system		AH83.30-N-0004-01A
	Notes on coolant		AH20.00-N-2080-01A
	Notes on handling refrigerant R134a		AH83.30-N-0003-01A
	Notes on handling refrigerant R1234yf		AH83.30-P-0003-02A
	Remove/install
1	Drain air conditioning system, then disconnect air conditioning service unit	MODEL 176, 246 with CODE 2U8 (Refrigerant R-1234yf)	AR83.30-P-1760YF
		MODEL 117, 156, 176, 242, 246 without CODE 2U8 (Refrigerant R-1234yf)	AR83.30-P-1760NKB
2	Remove coolant circulation pump (M13/5) from bracket (34)	MODEL 117, 156, 176, 242 (except 242.89), 246 with CODE 581 (Comfort automatic air conditioning) without CODE 228 (Auxiliary heater)	AR83.25-P-1170NKB
		MODEL 117, 156, 176, 242 (except 242.89), 246 with CODE 228 (Auxiliary heater) with CODE 581 (Comfort automatic air conditioning) MODEL 117, 156, 176, 242 (except 242.89), 246 with CODE 228 (Auxiliary heater) without CODE 581 (Comfort automatic air conditioning) The heater hoses at the coolant circulation pump (M13/5) remain connected.	AR83.25-P-1170NKA
3	Unscrew nut (32) and detach clamp (33)	Clamp (33) remains in vehicle.
4	Remove push button (42) on firewall	MODEL 242.890
5	Remove screw/bolt (40) and remove bracket (41)	MODEL 242.890
6	Unscrew nut (5)	Nut, low- and high-pressure lines to expansion valve	*BA83.30-P-1002-01G
7	Pull low-pressure line (4) out of expansion valve (1) and close off	Close off opening of low-pressure line (4) and expansion valve (1) using suitable stop plugs. Replace sealing ring (11) of low-pressure line (4).
8	Unscrew nut (6)	Nut, low- and high-pressure lines to expansion valve	*BA83.30-P-1002-01G
9	Pull high pressure line (7) out of expansion valve (1) and close off	Close off opening of high pressure line (7) and expansion valve (1) using suitable stop plugs. Replace sealing ring (11) of high-pressure line (7).
10	Release pressure in cooling system	Carefully open cap at coolant expansion reservoir and then close again.
11	Clamp off coolant hoses (14, 17) with pinch-off pliers (13)
12	Release catch springs (15, 16) at coolant hoses (14, 17)
13	Detach coolant hoses (14, 17) from connection fittings at air conditioner housing (A32)
14	Close off connection fittings at air conditioner housing (A32) using suitable stop plugs	The connection fittings of the air conditioner housing (A32) must be closed off. Otherwise coolant may escape and the vehicle interior may be soiled.
15	Remove cross member under instrument panel		AR68.10-P-1120NKB
16	Disconnect battery ground line		AR54.10-P-0003NKB
17	Unscrew nuts of positive line and ground line of PTC heater booster and remove positive line and ground line from PTC heater booster	MODEL 117, 156, 176, 246 with ENGINE 607, 651
			AR83.70-P-8000NKB
18	Disconnect electrical connector (22) from the blower regulator (A32n1)
19	Detach drain hose (24) from air conditioner housing (A32)
20	Detach cable bracket (25) from air conditioner housing (A32)
21	Unhook ground line (23) from air conditioner housing (A32)
22	Detach retaining clamps (20, 21) with cable duct (26) from air conditioner housing (A32)
23	Have someone assist you when removing the air conditioner housing (A32) from the vehicle	Carefully take out air conditioner housing (A32). Otherwise components in the vehicle interior may be damaged.
24	Install in the reverse order
25	Fill coolant, bleed cooling system and check it for leaks	MODEL 117, 156, 176, 242, 246
		MODEL 117, 156, 176, 242, 246 with ENGINE 270 MODEL 117, 156, 176, 246 with ENGINE 651 MODEL 176 with ENGINE 607	AR20.00-P-1142NKB