Check low-temperature circuit cooling system for leaks - AR09.41-P-1010RKC

ENGINE 279 in MODEL 231 

MODIFICATION NOTES

26.09.2014

Mixing ratio coolant

BF20.00-P-1001-04A

Fig 1: Checking Low-Temperature Circuit Cooling System For Leaks

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 sensor system for trunk lid opening/closing		AH80.61-P-0001-01A
	Notes on coolant		AH20.00-N-2080-01A
	Remove
1	Remove engine cover
2	Remove lower front engine compartment paneling	Only remove center and front engine compartment paneling.	AR61.20-P-1105RK
3	Unscrew cap (1) on low-temperature circuit coolant expansion reservoir (2)	Unscrew cap (1) slowly on low-temperature circuit coolant expansion reservoir (2) and reduce overpressure. Scolding can occur otherwise through spitting out of hot coolant.
	Check
4	Check coolant level and antifreeze content coolant in low-temperature circuit	If antifreeze content of coolant is too low, either antifreeze protection must be added or the coolant must be replaced.	AR09.41-P-6834RKC
		Coolant mixing ratio	*BF20.00-P-1001-04A
5	Screw on tester cap (3) at low-temperature circuit coolant expansion reservoir (2)	Test cap	Figure
6	Connect pressure pump (4) at test cap (3)	Pressure pump	Figure
7	Apply pressure to the low-temperature circuit	The specified test pressure must not be exceeded. Damage can occur to the cooling system otherwise. Engine 279 Test pressure for pressure-testing the engine cooling system	*BE20.30-P-1005-01A
8	Perform visual inspection on coolant carrying components	The catch springs for the Henn coupling must be checked for their condition and seat and replaced if necessary. Coolant loss can occur otherwise. 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, for example, the possibility that the coolant can also be suctioned over a defective charge air cooler and find its way into the combustion chamber.	AR09.41-P-1311-01AL
	Install
9	Remove overpressure over the valve at the pressure pump (4) and remove pressure pump (4)	To do this actuate pressure relief button on the pressure pump (4). Pressure pump	Figure
10	Unscrew tester cap (3) at low-temperature circuit coolant expansion reservoir (2)	Test cap	Figure
11	Check coolant level and antifreeze content coolant	Coolant mixing ratio	*BF20.00-P-1001-04A
12	Screw cap (1) onto low-temperature circuit coolant expansion reservoir (2)
13	Install engine cover
14	Install lower engine compartment paneling		AR61.20-P-1105RK

RADIATOR OR EXPANSION RESERVOIR CAP

Number	Designation			1-stage cover latch	2-stage cover latch
BE20.30-P-1005-01A	Test pressure for pressure-testing the engine cooling system	Overpressure	bar	1, 4	1, 4

COOLANT MIXING RATIO

Number	Designation				Engine all
BF20.00-P-1001-04A	Coolant mixing ratio	Antifreeze/water	Up to -37°C	%	50/50
			As of -38 °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
			Specification		Premixed coolant (Specification 326.0). 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