Drain/pour in coolant - AR20.00-P-1142EL

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ENGINE 157, 276, 278 in MODEL 212, 218

MODIFICATION NOTES

12.2.14	Work procedure altered and special tools for electrical vacuum pump and NTKL adaptation, added.	Operation steps 14 to 26	AR20.00-P-1142-04A
26.9.14	coolant mixing ratio		BF20.00-P-1001-04A

Fig 1: Coolant Drain/Pour Components

Courtesy of MERCEDES-BENZ USA

Shown on engine 276 except code ME04 (Mild HYBRID drive)

Fig 2: Coolant Drain/Pour Components - Shown On Engine 276 Except Code ME04

Courtesy of MERCEDES-BENZ USA

	Risk of death when touching components on vehicles with high-voltage on-board electrical system	Do not touch components and open lines of the high-voltage on-board electrical system. Persons who wear electronic implants (e.g. cardiac pacemakers), must not carry out any work on high-voltage on-board electrical systems.	AS54.00-Z-0001-01A
	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
	Risk of death caused by vehicle slipping or toppling off of the lifting platform.	Align vehicle between vehicle lift columns and position the four support plates at the vehicle lift support points specified by the vehicle manufacturer.	AS00.00-Z-0010-01A
	Note on high-voltage on-board electrical system		AH54.00-P-0010-01A
	Notes on coolant		AH20.00-N-2080-01A
	Notes on coolant level		AH20.00-P-1142-01CW
	Lowering
1	Perform enable for the high voltage on-board electrical system	ENGINE 276 in MODEL 212 with CODE ME04 (Mild hybrid drive)
1		ENGINE 276 in MODEL 212 with CODE ME04 (Mild hybrid drive)	AR54.10-P-1150EH
2	Unscrew cap (2) on coolant expansion reservoir (4)	Unscrew cap (2) slowly and relieve overpressure.
3	Remove bottom engine compartment paneling		AR61.20-P-1105EW
4	Push drain hose (3) onto left fitting (3a) on radiator (6)
5	Slacken drain screw (7) at radiator (6) and drain off coolant	Remove drain screw (7) only until the coolant flows off. Permanent damage to the drain screw (7) will occur otherwise. Catch coolant with suitable container. Observe regulations for disposal of coolant.
6	Switch on ignition for 5 seconds and then switch off again	ENGINE 157, 278 in MODEL 212, 218 ENGINE 276 in MODEL 212 with CODE ME04 (Mild hybrid drive) Repeat this procedure twice after a waiting time of about 30 s in order to empty the low-temperature water circuit.
7	Protect power electronics control unit from escaping coolant	ENGINE 276 in MODEL 212 with CODE ME04 (Mild hybrid drive)
8	Loosen drain screw (5)	ENGINE 276 in MODEL 212, 218
8	Loosen drain screw (5)	Drain screw on coolant pump	*BA20.10-P-1008-01AA
9	Push drain hose (3) onto drain screw (5)	ENGINE 276 in MODEL 212, 218
10	Further turn drain screw (5) and drain off coolant	ENGINE 276 in MODEL 212, 218
		Filling
11	Tighten drain screw (7) on cooler (6) and detach drain hose (3) from fitting (3a)
12	Tighten drain screw (5) at drain screw and detach drain hose (3) from fitting (3a)	ENGINE 276 in MODEL 212, 218
13	Pour in coolant and bleed engine cooling system		AR20.00-P-1142-04A
	Anticorrosion/antifreeze agents (Specification 325.0)		Anticorrosion/antifreeze agents (Specification 325.0). See https://bevo.mercedes-benz.com/index.php?language_id=1
	Coolant specifications		Coolant (Specification 310.1). See https://bevo.mercedes-benz.com/index.php?language_id=1
		Reuse the clean coolant.
		Coolant mixing ratio	*BF20.00-P-1001-04A
		Cooler vacuum filling device	Figure
		Test cap	Figure
		NTKL Adoption	Figure
		Electric vacuum pump	Figure
14	Switch on ignition for 5 seconds and then switch off again	ENGINE 276 in MODEL 212 with CODE ME04 (Mild hybrid drive) Repeat this procedure twice after a waiting time of about 30 2s in order to empty the low-temperature water circuit.
	Check
15	Check engine cooling system for leaktightness		AR20.00-P-1010EL
16	Install lower engine compartment paneling		AR61.20-P-1105EW
17	Perform initial startup of high voltage on-board electrical system	ENGINE 276 in MODEL 212 with CODE ME04 (Mild hybrid drive)
17		ENGINE 276 in MODEL 212 with CODE ME04 (Mild hybrid drive)	AR54.10-P-1150EH
	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
18	Perform an engine test run and check engine cooling system for proper operation

COOLANT PUMP, COOLANT THERMOSTAT

Number	Designation			ENGINE 276
BA20.10-P-1008-01AA	Drain screw on coolant pump	Stage 1	Nm	6
BA20.10-P-1008-01AA	Drain screw on coolant pump	Stage 2	∠°	90

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

Courtesy of MERCEDES-BENZ USA

Fig 4: Identifying Electric Vacuum Pump (285 589 02 21 00)

Courtesy of MERCEDES-BENZ USA

Fig 5: Identifying NTKL Adoption (285 589 01 21 00)

Courtesy of MERCEDES-BENZ USA

Fig 6: Identifying Cooler Vacuum Filling Device (285 589 00 21 00)

Courtesy of MERCEDES-BENZ USA