Remove/Install Radiator Unit - AR20.20-P-3871MNP

Engine 177 in model 167

Fig 1: Radiator Unit Components Location - Engine 177 In Model 167

Courtesy of MERCEDES-BENZ USA

Courtesy of MERCEDES-BENZ USA

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 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 to skin and eyes suffering scalding from contact with hot coolantspray. Risk of poisoning from swallowing coolant.	Do not open cooling system unless coolant temperature is below 90°C. Open cap slowly and release the overpressure. Do not pour coolant into beverage containers. Wear protective gloves, protective clothing and safety glasses.	AS20.00-Z-0001-01A
	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	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
Notice	Protect air conditioning circuit and components from moisture when carrying out repair work		AH83.30-P-0005-01KOA
Notice	Notes on self-locking nuts and bolts		AH00.00-P-0001-01KOA
Notice	Notes on avoiding damage through contamination and foreign objects		AH00.00-P-5000-01A
	Notes on handling refrigerant R1234yf		AH83.30-P-0003-02A
	Notes on handling refrigerant R134a		AH83.30-P-0003-01KOA
	Remove/install
1	Discharge air conditioning system.		AR83.30-P-1760ME
2	Drain off coolant.		AR20.00-P-1142MNP
3	Remove fan unit.		AR20.40-P-5050MNP
4	Release and disconnect coolant hoses at radiator unit (1).		AR20.20-P-7441-01RQ
5	Remove upper radiator shutters.	Engine 177 in model 167 with code 9U7 (Aerodynamic measure package control code)
			AR20.20-P-3882MNO
6	Remove coolant lines (12).		AR20.20-P-7441-01RQ
7	Remove bottom additional cooler.		AR20.20-P-3866MNP
8	Remove nuts (11).	Engine 177 in model 167 except code M036 (Maybach version) Bolt/nut, inner holder for additional cooler to connecting carrier/mounting support/fender	*BA20.20-P-1006-01Q
9	Remove expansion rivets (9) and remove air ducting (10) of the additional cooler.	Dismantling tool	Fig 3
10	Remove expansion rivets (5) and remove air duct segment (6).	Dismantling tool	Fig 3
11	Remove refrigerant lines from the capacitor, place to one side, and seal openings with suitable stop plugs.
	Compressor oils (specification 362.1)		BB00.40-P-0362-01A
		Install new seals and wet with compressor oil.
		Nut, refrigerant line to condenser	*BA83.30-P-1003-01U
		Assembly tool	Fig 2
		Record plug	Fig 4
12	Release and disconnect electrical connector o the refrigerant pressure sensor (B12/2), disconnect, and unclip electric line from the cooler unit (1).
13	Secure radiator unit (1) against falling down.
14	Remove mounting supports (8).	Ensure lower elastomer bearings of radiator unit (1) are seated centrally.
		Wet lower elastomer bearings of radiator unit (1) with lubricant. Lubricant, rubber assembly 1 L	*BR00.45-Z-1010-06A
		Screw, radiator unit mounting support to front crossmember	*BA62.30-P-1007-02I
15	Unclip side air duct segments from radiator unit (1).
16	Release cooler unit (1) and remove downward	Aid of helper required.
		The cooler unit (1) consists of the additional cooler, cooler, capacitor and, low-temperature circuit cooler.
	Check
17	Check cooler unit (1) for damage.	If there is a problem, ↓ Replace corresponding component.
18	Check lower elastomer bearings of radiator unit (1) for wear and damage.	If there is a problem, ↓ Replace lower elastomer bearings
19	Install in the reverse order.