Remove/install expansion reservoir - AR20.30-P-4950GZS (ML63 AMG)

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ENGINE 156 in MODEL 164

Fig 1: Identifying Expansion Reservoir Components

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

	Remove/install
	Risk of injury to skin and eyes caused by 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
	Risk of injury caused by fingers being pinched or crushed when removing, installing or aligning hoods, doors, trunk lids, tailgates or sliding roof.	Keep body parts and limbs well clear of moving parts.	AS00.00-Z-0011-01A
1	Open engine hood		AR88.40-P-1000GZ
2	Screw down cap on coolant expansion reservoir (4) and suction off coolant	Hand pump	Fig 2
	Notes on coolant	All engines	AH20.00-N-2080-01A
	Coolant specifications	Sheet 310.1	BB00.40-P-0310-01A
	Anticorrosion/antifreeze agents (Sheet 325.0)	Sheet 325.0	BB00.40-P-0325-00A
3	Disconnect electrical connector (2) at coolant level indicator switch (S41)
4	Remove overflow hose (1) on coolant (4) expansion reservoir
5	Screw down nut (3)
6	Detach coolant hose (5, 6)	Detach coolant hose (5, 6) with expansion reservoir raised (4).
		Hose clamp pliers	*WH58.30-Z-1019-02A
7	Remove coolant (4) expansion reservoir	Lift coolant expansion reservoir (4) upwards out of rubber mounts
8	Install in the reverse order
	Checking
9	Check coolant level and correct if necessary.	Cooling system	*BF20.00-P-1001-02U
	Notes on coolant level		AH20.00-P-1142-01GZB
10	Inspect cooling system for leaks		AR20.00-P-1010GZS
	Risk of accident caused by vehicle starting off by itself when engine is running. Risk of injury caused by contusions and burns during starting procedure or when working near the running engine	Secure vehicle to prevent it from moving by itself. Wear closed and snug-fitting work clothes. Do not grasp hot or rotating parts.	AS00.00-Z-0005-01A
11	Conduct engine test run and check the engine for leaks	In the event of oil loss determine and eliminate cause, otherwise malfunctions, transmission damage, and serious environmental pollution may occur.

COOLING SYSTEM

Number	Designation			Engine 156 in model 164, 251
BF20.00-P-1001-02U	Cooling system	Total filling capacity	≈Liters	7.5
		Antifreeze/water	Up to -37°C	50/50
		Antifreeze/water	Up to -45°C	55/45
		Specifications for Operating Fluids	Sheet
			Sheet	BB00.40-P-0310-01A
			Sheet
			Sheet	BB00.40-P-0325-00A

Fig 2: Identifying Hand Pump (210 589 00 71 00)

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

COMMERCIALLY AVAILABLE TOOLS

Number	Designation
WH58.30-Z-1019-02A	Hose clamp pliers (length 210 mm, clamping range 80 mm)