Remove/Install Low-Temperature Circuit Upper Coolant Expansion Reservoir - AR09.41-P-0050MNO

Engine 176 In Model 167 

Fig 1: Low-Temperature Circuit Upper Coolant Expansion Reservoir Components Location - Engine 176 In Model 167

Courtesy of MERCEDES-BENZ USA

	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
Notice	Notes on avoiding damage through contamination and foreign objects		AH00.00-P-5000-01A
Notice	Notes on coolant		AH20.00-P-2080-01KOA
	Notes on coolant level		AH20.00-P-1142-01CW
	Remove/install
1	Remove upper engine cover.
			AP01.10-P-2405-01M
		: Only install upper engine cover after the leak test.
2	Slowly open cap of coolant expansion reservoir (1) and remove.
3	Suction off coolant from coolant expansion reservoir (1).	Coolant mixing ratio	*BF20.00-P-1001-04A
		Hand pump	Fig 2
4	Remove bleed line (2) from coolant expansion reservoir (1).		AR20.30-P-0010-02XGA
5	Remove feed line (3) from coolant expansion reservoir (1).		AR20.30-P-0010-02XGA
6	Remove vacuum line (4) from coolant expansion reservoir (1).
7	Remove screw (5).	Bolt, low-temperature circuit expansion reservoir at top to low-pressure line	*BA09.41-P-1011-01X
8	Remove coolant expansion reservoir (1) in upward direction.	: Wet elastomer bearings (6) with lubricant. Lubricant, rubber assembly 1 L	*BR00.45-Z-1010-06A
9	Check elastomer bearings (6) of coolant expansion reservoir (1) for damage.	If there is a problem, ↓ Replace the elastomer bearings (6).
10	Install in the reverse order.
	Check
11	Check low-temperature circuit for leak tightness.		AR09.41-P-1011MNO
	Risk of accident  from vehicle starting off by itself when engine running. Risk of injury  (bruises and burns) resulting from working on the engine while it is being started or when it is running.	Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.	AS00.00-Z-0005-01A
	Risk of burn injuries,  suffocation and poisoning when working on the exhaust system and the components connected to it. Risk of suffocation and risk of poisoning caused by inhalation of gaseous and solid components of the exhaust. Risk of poisoning  caused by skin contact with solid components of the exhaust.	Wear protective clothing and safety glasses. Use the extraction system. Move people out of the danger zone.	AS49.00-Z-0001-01A
12	Carry out engine test run. While doing so, check low-temperature circuit for proper operation and leak tightness.

CHARGE AIR LINE/CHARGE AIR COOLING

Number	Designation		Engine 176
BA09.41-P-1011-01X	Bolt, low-temperature circuit expansion reservoir at top to low-pressure line	Nm	9

COOLANT MIXING RATIO

Number	Designation				All engines, except engine 178 in model 190.381
BF20.00-P-1001-04A	Coolant mixing ratio	Antifreeze/water	Up to -25°C	%	-
			Up to -37°C	%	50/50
			As of -38°C	%	55/45
			Overview and specifications sheet		BB00.40-P-0310-01A
			References to specification sheet		BB00.40-P-0310ZZ

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

Courtesy of MERCEDES-BENZ USA

REPAIR MATERIALS

Number	Designation	Order number
BR00.45-Z-1010-06A	Lubricant, rubber assembly 1 L	A 000 989 03 67