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

ENGINE 272, 273 in MODEL 211, 219 

Fig 1: Inspecting Cooling System For Leaks

Courtesy of MERCEDES-BENZ USA

	Removing
	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	Unscrew cap (1) on expansion reservoir (2)	Slowly unscrew cap and reduce the excess pressure.
4	Check coolant level and antifreeze content of coolant.	If the antifreeze content of the coolant is too low, either antifreeze must be added or the coolant must be replaced. ↓
		Drain coolant, fill.	AR20.00-P-1142TS
5	Screw test cap (3) onto expansion reservoir (2)		Figure
6	Connect pressure pump (4) at test cap (3)		Figure
7	Apply test pressure to cooling system	To prevent damage to the cooling system, do not exceed the stated test pressure	*BE20.30-P-1005-01A
	Checking
8	Inspect condition and installation at hose clamps; retighten or replace if necessary	6 mm socket hexagon on flexible shaft for hose clamps with worm drive	*WH58.30-Z-1001-06A
		7 mm socket hexagon on flexible shaft for hose clips with worm drive	*WH58.30-Z-1002-06A
9	Check coolant hoses and heater hoses and their connecting points for condition and coolant loss	Replace coolant hoses and heater hoses if required.
	Install
10	Screw test cap (3) onto expansion reservoir (2)	Slowly unscrew the test cap (3) and reduce the excess pressure.
11	Remove pressure pump (4)
12	Screw cap (1) onto expansion reservoir (2)
13	Switch off ignition

CAP FOR RADIATOR OR EXPANSION RESERVOIR

Number	Designation		2-stage cap
BE20.30-P-1005-01A	Test pressure for pressure-testing cooling system	Excess pressure in bar	1.4

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

COMMERCIALLY AVAILABLE TOOLS

Number	Designation
WH58.30-Z-1001-06A	6 mm socket hexagon on flexible shaft for hose clamps with worm drive
WH58.30-Z-1002-06A	7 mm socket hexagon on flexible shaft for hose clamps with worm drive