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

Engine 177 in model 217, 222

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 engine compartment paneling		AR61.20-P-1105LF
		Only install lower engine compartment paneling after leak test.
2	Remove upper engine cover	: Only install upper engine cover after the leak test.
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 i necessary	Cooling system	*BF20.00-P-1001-02LA
		Coolant mixing ratio	*BF20.00-P-1001-04A
5	Attach the tester cap (3) at the low-temperature circuit expansion tank (2)	Test cap	Fig 1
6	Connect pressure pump (4) at tester cap (3)	Pressure pump	Fig 2
7	Apply compressed air to low-temperature circuit for 2 minutes at the test pressure	Do not exceed the specified test pressure. Otherwise the low-temperature circuit will 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 a visual inspection on the assembly parts 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 the pressure	Pressure pump	Fig 2
10	Remove the tester cap (3) from the low-temperature circuit expansion tank (2)	Test cap	Fig 1
11	Check coolant level and antifreeze content coolant	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 coolant expansion reservoir (2)
13	Install upper engine cover
14	Install lower engine compartment paneling		AR61.20-P-1105LF

COOLING SYSTEM CHECK VALUES

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

COOLING SYSTEM

Number	Designation				Engine 177 in model 217	Engine 177 in model 222
BF20.00-P-1001-02LA	Cooling system	Workshop replacement amount	Main circuit	Liter	≈ 13, 6	≈ 13, 5
			Low Temp Circuit 1	Liter	≈ 6, 2	≈ 6, 2
			Low Temp Circuit 2	Liter	-	-
		Antifreeze/water	Down to -37°C	%	50/50	50/50
			-38°C and below	%	55/45	55/45
			Fluids Specifications		BB00.40-P-0310-01A	BB00.40-P-0310-01A
			Fluids Specifications		BB00.40-P-0325-06A	BB00.40-P-0325-06A
			Fluids Specifications		BB00.40-P-0326-06A	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 specifications sheet		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