Inspect cooling system for leaks - AR20.00-P-1010EL

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ENGINE 157, 276, 278 in MODEL 212, 218

MODIFICATION NOTES

26.9.14

coolant mixing ratio

BF20.00-P-1001-04A

Fig 1: Inspecting Cooling System For Leaks

Courtesy of MERCEDES-BENZ USA

	Remove
	Risk of injury caused by fingers being jammed or pinched when removing, installing or aligning hoods, doors, trunk lid/rear-end door or sliding roof.	No parts of the body or limbs should be within the operating area when the components are moving.	AS00.00-Z-0011-01A
	Risk of injury to skin and eyes suffering 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
1	Switch on ignition
2	Adjust heater to maximum heat output
3	Unscrew cap (1) from coolant expansion reservoir (2)	Unscrew cap (1) slowly and relieve overpressure.
4	Check coolant level and antifreeze content coolant	If antifreeze content of coolant is too low, either antifreeze protection must be added or the coolant must be replaced.
5	Screw on test cap (3) at coolant expansion reservoir (2)	ENGINE 157, 276, 278 in MODEL 212, 218 Test cap	Figure
6	Connect pressure pump (4) at tester cap (3)	ENGINE 157, 276, 278 in MODEL 212, 218 Pressure pump	Figure
7	Apply test pressure to cooling system	In order to prevent damage to the cooling system. The specified test pressure must not be exceeded.
	Check
8	Perform visual inspection on coolant carrying components	Open and close coupling Check condition and seating of the Henn coupling; replace catch springs if necessary. To avoid coolant loss. Check condition and coolant loss for all coolant carrying components and connections. The coolant carrying components should be checked for inner leaktightness if there is no external coolant loss. There is the possibility, for example, that coolant can find its way over a defective cylinder head gasket into the combustion chamber or over a defective water heat exchanger into the oil circuits.	AR09.41-P-1311-01AL
	Install
9	Relieve test pressure in cooling system	To do this actuate pressure relief button on the pressure pump (4)
10	Detach pressure pump (4) from tester cap (3)
11	Unscrew test cap (3) on coolant expansion reservoir (2)
12	Switch off ignition
13	Check coolant level and antifreeze content coolant
	Notes on coolant level		AH20.00-P-1142-01CW
	Notes on coolant level	Coolant mixing ratio	*BF20.00-P-1001-04A
14	Screw cap onto coolant expansion reservoir (2)

COOLANT MIXING RATIO

Number	Designation			ENGINE ALL
BF20.00-P-1001-04A	Coolant mixing ratio	Antifreeze/water	up to -37°C	50/50
		Antifreeze/water	up to -45°C	55/45
		Specification		Coolant (Specification 310.1). See https://bevo.mercedes-benz.com/index.php?language_id=1
		Specification		Anticorrosion/antifreeze agents (Specification 325.0). See https://bevo.mercedes-benz.com/index.php?language_id=1

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

Courtesy of MERCEDES-BENZ USA

Fig 3: Identifying Test Cap (210 589 00 91 00)

Courtesy of MERCEDES-BENZ USA