Check Low-Temperature Circuit For Leaktightness - AR09.41-P-1011MNP

Engine 177 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 coolant		AH20.00-P-2080-01KOA
	Notes on coolant level		AH20.00-P-1142-01CW
	Remove
1	Remove lower engine compartment paneling.		AR61.20-P-1105ME
2	Remove upper engine cover.		AP01.10-P-2405-01E
3	Remove cap (1).	The coolant temperature should be approx 40°C
	Check
4	Check coolant level and antifreeze content of coolant in low-temperature circuit and correct if necessary.	Cooling system	*BF20.00-P-1001-02LA
		Coolant mixing ratio	*BF20.00-P-1001-04A
5	Attach tester cap (3) to low-temperature circuit expansion reservoir (2).	Test cap	Fig 1
6	Connect pressure pump (4) at tester cap (3).	Pressure pump	Fig 2
7	Apply test pressure to low-temperature circuit for 2 min.	Do not exceed the specified test pressure Low-temperature circuit will otherwise be damaged. There should be no pressure loss within a period of 2 minutes Test pressure for pressure-testing the low-temperature circuit	*BE20.30-P-1001-01D
8	Perform visual inspection of components carrying coolant	In the event of pressure loss. Check condition and coolant loss for all assembly part carrying coolant and connections and remove coolant loss if necessary using suitable measures
9	Actuate pressure relief button on pressure pump (4) and relieve pressure.	Pressure pump	Fig 2
10	Remove tester cap (3) from low-temperature circuit expansion reservoir (2).	Test cap	Fig 1
11	Check coolant level and antifreeze content of coolant in low-temperature circuit and correct if necessary.	Cooling system	*BF20.00-P-1001-02LA
		Coolant mixing ratio	*BF20.00-P-1001-04A
	Install
12	Attach cap (1) to low-temperature circuit expansion reservoir (2).
13	Install upper engine cover.
			AP01.10-P-2405-01E
14	Install lower engine compartment lining.		AR61.20-P-1105ME

COOLING SYSTEM CHECK VALUES

Number	Designation			Engine 177
BE20.30-P-1001-01D	Test pressure for pressure-testing the low-temperature circuit	Overpressure	bar	1, 4

COOLING SYSTEM

Number	Designation				Engine 177 in model 167
BF20.00-P-1001-02LA	Cooling system	Workshop replacement amount	Main circuit	Liter	≈ 15, 7
			Low Temperature circuit 1	Liter	≈5, 0
			Low Temperature circuit 2	Liter	-
		Antifreeze/water	Down to -37°C	%	50/50
			-38°C and below	%	55/45
			Fluids Specifications		BB00.40-P-0310-01A
			Fluids Specifications		BB00.40-P-0325-06A
			Fluids Specifications		BB00.40-P-0326-06A

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 sheet specifications		BB00.40-P-0310-01A
			References to sheet specification		BB00.40-P-0310ZZ

Fig 1: Identifying Test Cap (210 589 00 91 00)

Courtesy of MERCEDES-BENZ USA

Fig 2: Identifying Pressure Pump (124 589 24 21 00)

Courtesy of MERCEDES-BENZ USA