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

ENGINE 275 in MODEL 215, 216, 220, 221, 230 Low-temperature circuit 

ENGINE 285 in MODEL 240 Low temperature circuit 

Shown on engine 285 

Fig 1: Inspecting Cooling System For Leaks

Courtesy of MERCEDES-BENZ USA

	Remove/install
	Risk of death  caused by vehicle slipping or toppling off the lifting platform.	Align vehicle between columns of vehicle lift and position four support plates at vehicle lift support points specified by vehicle manufacturer.	AS00.00-Z-0010-01A
1	Remove engine cover.	Engine 275.95, 285	AR01.10-P-2405LA
		Engine 275.98	AR01.10-P-2405IM
2	Remove cap (1) of filler neck (2)	Only open cap (1) at a coolant temperature below 40°C otherwise coolant can flow out. If coolant has flowed out, the low temperature circuit must be bled: ↓
		Bleed low temperature circuit	AR20.00-P-1145H
	Checking
3	Check engine coolant level and antifreeze content of coolant in the low temperature circuit, correct if required		*BF20.00-P-1001-04A
	Notes on coolant		AH20.00-N-2080-01A
	Notes on coolant level		AH20.00-P-1142-01V
		In case of inadequate antifreeze content: Replace coolant of low temperature circuit: ↓ Drain/fill in coolant
		Model 215, 216, 220, 221, 230	AR20.00-P-1142HM
		Model 240	AR20.00-P-1142HN
4	Mount test cap (01) on filler neck (2)		Fig 3
5	Connect testing unit (02) at test cap (01)		Fig 2
6	Apply pressure to low temperature circuit	Test pressure approx. 1.4 bar.
7	Check condition and coolant loss of coolant lines and hoses as well as connecting points; replace coolant lines and hoses if required	In the engine compartment.
8	Check condition and seating of the clamps; remove clamp with hose clamp pliers if necessary and replace
9	Remove bottom engine compartment paneling	Model 215, 220	AR61.20-P-1105M
		Model 216, model 221 without code (Z07) Top protection	AR61.20-P-1105SX
		Model 221 with code (Z07) Top protection	AR61.20-P-1105SXS
		Model 230 without code (P99) "AMG Black Series"	AR61.20-P-1105R
		Model 230 with code (P99) Special model "AMG Black Series"	AR61.20-P-1105RBS
		Model 240	AR61.20-P-1105H
10	Check condition and coolant loss of low temperature circuit radiator, coolant lines and hoses as well as connecting points; replace low temperature circuit radiator, as well as coolant lines and hoses if required	If vehicle is raised.
11	Check condition and seating of the clamps; remove clamp with hose clamp pliers if necessary and replace	If no water loss can be determined from outside: ↓
		Remove engine induction air ducts from left and right-side charge air coolers.	AR09.41-P-8623H
		Check left and right charge air cooler at air inlet using a flexible endoscope, cylinder illumination unit and inspection mirror for inner leaktightness. In the event of leaks: ↓	AR09.41-P-6800-01H
		Replace left and/or right-side charge air cooler. If no water loss is determined at the side of the air inlet: ↓	AR09.41-P-6817HH
		Leaving coolant lines connected, remove left and right-side charge air coolers from engine.	AR09.41-P-6817HH
		Check left and right charge air cooler at air outlet using a flexible endoscope, cylinder illumination unit and inspection mirror for inner leaktightness. In the event of leaks: ↓	AR09.41-P-6800-01HH
		Replace left and/or right-side charge air cooler.	AR09.41-P-6817HH
12	Install in the reverse order
13	Pour in coolant	After installation of new parts
14	Bleed low temperature circuit	After installation of new parts	AR20.00-P-1145H

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

Courtesy of MERCEDES-BENZ USA

Fig 3: Identifying Test Cap (124 589 00 91 00)

Courtesy of MERCEDES-BENZ USA