Inspect Cooling System For Leaks - AR20.00-P-1010MNB

Engine 178 in model 190 

Courtesy of MERCEDES-BENZ USA

	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 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	Switch on ignition
2	Adjust heater to maximum heat output
3	Unscrew cap (1) slowly on coolant expansion reservoir (2) and reduce overpressure
4	Check coolant level and antifreeze content coolant	Coolant mixing ratio	*BF20.00-P-1001-04A
5	Screw tester cap (3) onto coolant expansion reservoir (2)	Test cap	Fig 1
6	Connect pressure pump (4) at tester cap (3)	Pressure pump	Fig 2
7	Apply a test pressure to the engine cooling system for 2 minutes	Do not exceed the specified test pressure. Damage can occur on the engine cooling system otherwise.
		There should be no pressure loss within a period of 2 minutes.
		Test pressure for pressure-testing the cooling system	*BE20.30-P-1002-01D
	Check
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.
	Install
9	Remove overpressure over the valve at the pressure pump (4) and remove pressure pump (4)	Pressure pump	Fig 2
10	Unscrew tester cap (3) at coolant expansion reservoir (2).	Test cap	Fig 1
11	Switch off ignition
12	Check coolant level and antifreeze content coolant	If necessary
		Coolant mixing ratio	*BF20.00-P-1001-04A
13	Screw cap (1) onto coolant expansion reservoir (2)

COOLING SYSTEM CHECK VALUES

Number	Designation			Engine 178
BE20.30-P-1002-01D	Test pressure for pressure-testing the cooling system	Overpressure	bar	1, 4

COOLANT MIXING RATIO

Number	Designation				Engine 178 in model 190.381	All engines, except engine 178 in model 190.381
BF20.00-P-1001-04A	Coolant mixing ratio	Antifreeze/water	Up to -25°C	%	40/60	-
			Up to -37°C	%	-	50/50
			As of -38°C	%	-	55/45
			Overview and specifications sheet		BB00.40-P-0310-01A	BB00.40-P-0310-01A
			References to sheet specification		BB00.40-P-0310ZZ	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