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

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ENGINE 156 in MODEL 204, 212

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 Screws

Courtesy of MERCEDES-BENZ USA

	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
	Notes on coolant		AH20.00-N-2080-01A
	Drain off
1	Detach ground line from battery	When draining coolant at the right crankcase drain screw (3).
	Notes on battery		AH54.10-P-0001-01A
		ENGINE 156 in MODEL 204	AR54.10-P-0003CW
		ENGINE 156 in MODEL 212	AR54.10-P-0003EW
2	Unscrew cap of the coolant expansion reservoir	Unscrew cap slowly and relieve overpressure.
	Drain coolant at radiator
3	Raise vehicle
4	Slide drain hose onto fitting on radiator	The fitting is located at the bottom left on the radiator.
5	Unfasten radiator drain screw (1) and drain coolant.	Only remove radiator drain screw (1) until coolant flows out. The radiator drain screw (1) can be permanently damaged otherwise. Observe regulations for disposal of coolant. Catch coolant in a suitable container.
	Drain coolant on crankcase
6	Unfasten crankcase drain screw on the left (3) and crankcase drain screw on the right (2)	Only loosen left crankcase drain screw (2) and right crankcase drain screw (3) at crankcase until they can be turned by hand.
7	Push drain hose onto left crankcase drain screw (2) and right crankcase drain screw (3)
8	Further unfasten left crankcase drain screw (2) and right crankcase drain screw (3) and drain off coolant	Observe regulations for disposal of coolant. Catch coolant in a suitable container.
	Pour in
9	Tighten drain screw (1) at radiator and detach drain hose from fitting	After coolant has been drained at radiator
10	Detach drain hoses from left crankcase drain screw (2) and right crankcase drain screw (3)	After coolant has been drained at crankcase
11	Tighten crankcase drain screw on the left (3) and crankcase drain screw on the right (2)	Drain screw for coolant	*BA03.20-P-1009-01J
12	Pour in coolant and ventilate engine cooling system
	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
			AR20.00-P-1142-04A
		Use clean coolant again.
		Coolant mixing ratio	*BF20.00-P-1001-04A
		NTKL Adoption	Figure
		Electric vacuum pump	Figure
		Test cap	Figure
		Cooler vacuum filling device	Figure
13	Connect ground line to battery	After draining coolant at the right crankcase drain screw (3).
		ENGINE 156 in MODEL 204	AR54.10-P-0003CW
		ENGINE 156 in MODEL 212	AR54.10-P-0003EW
	Check
14	Check engine cooling system for leaktightness		AR20.00-P-1010CMG
	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
15	Perform an engine test run and check engine cooling system for proper operation

DRAIN SCREW, COOLANT

Number	Designation		ENGINE 156
BA03.20-P-1009-01J	Drain screw for coolant	Nm	15

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

Fig 2: Identifying Test Cap (210 589 00 91 00)

Courtesy of MERCEDES-BENZ USA

Fig 3: Identifying Electric Vacuum Pump (285 589 02 21 00)

Courtesy of MERCEDES-BENZ USA

Fig 4: Identifying NTKL Adoption (285 589 01 21 00)

Courtesy of MERCEDES-BENZ USA

Fig 5: Identifying Cooler Vacuum Filling Device (285 589 00 21 00)

Courtesy of MERCEDES-BENZ USA