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

ENGINE 272.920 in MODELS 203.052/252/752 

ENGINE 272.940 in MODELS 203.054/254, 209.354/454 

ENGINE 272.960 in MODELS 203.056/256/756, 209.356/456 

ENGINE 272.970 in MODELS 203.087/287 

ENGINE 272.941 in MODELS 203.092/292 

ENGINE 273 in MODEL 209 

Fig 1: Inspecting Cooling System For Leaks

Courtesy of MERCEDES-BENZ USA

	Remove/install
	Risk of injury  caused by fingers being pinched or crushed  when removing, installing or aligning hoods, doors, trunk lids, tailgates or sliding roof.	Keep body parts and limbs well clear of moving parts.	AS00.00-Z-0011-01A
	Risk of injury  to skin and eyes caused by 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
1	Switch on ignition
2	Adjust heater to maximum heat output
3	Open engine hood and raise to vertical position	Model 203	AR88.40-P-1000P
		Model 209
4	Unscrew cap (1) on coolant expansion reservoir (2).	Slowly unscrew cap and reduce excess pressure.
5	Check coolant level and antifreeze content coolant.	If the antifreeze content of the coolant is too low, either antifreeze must be added or the coolant must be replaced. ↓ Drain, fill system with coolant.	AR20.00-P-1142QB
6	Screw test cap (01) onto coolant expansion reservoir (2).	Test cap	Figure
7	Connect pressure pump (02) at test cap (01)	Pressure pump	*124589242100
8	Apply test pressure to cooling system	To prevent damage to cooling system, do not exceed stated test pressure	*BE20.30-P-1005-01A
	Checking
9	Inspect condition and installation at hose clamps; retighten or replace if necessary		*WH58.30-Z-1001-06A
			*WH58.30-Z-1002-06A
10	Check coolant hoses and heater hoses and their connecting points for condition and coolant loss
11	Unscrew test cap (01) at coolant expansion reservoir (2).	Slowly unscrew test cap and reduce excess pressure.
12	Remove pressure pump (02)
13	Screw cap (1) onto coolant expansion reservoir (2).
14	Close engine hood	Model 203	AR88.40-P-1000P
		Model 209
15	Switch off ignition

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

Courtesy of MERCEDES-BENZ USA

Fig 3: Identifying Pressure Pump (124 589 24 21 00)

Courtesy of MERCEDES-BENZ USA