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

WARNING: This page does not describe the selected car, but rather 33 other vehicles, including the 2016 Mercedes-Benz E63 S AMG, 2016 Mercedes-Benz E400, 2016 Mercedes-Benz E350, 2016 Mercedes-Benz E300, and 2016 Mercedes-Benz E250. However, it is still accessible from the selected car via links, so may be relevant.

ENGINES 156 in MODEL 204, 212

Shown on model 221

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 caused by 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 slowly on expansion reservoir (1) and relieve overpressure
4	Check coolant level and antifreeze content coolant	Correct if necessary.
	Notes on coolant		AH20.00-N-2080-01A
5	Screw tester cap (2) on to expansion reservoir (1)		Fig 2
6	Connect pressure pump (3) at test cap (2)		Fig 3
	Checking
7	Apply test pressure to cooling system	To prevent damage to cooling system, do not exceed stated test pressure.
7	Apply test pressure to cooling system	Test pressure	*BE20.30-P-1005-01A
8	Check Henn couplings for all coolant hoses	Check the condition and seating of Henn couplings. Replace catch springs of the Henn couplings if necessary.
8	Check Henn couplings for all coolant hoses	See Open and close Henn coupling.	AR09.41-P-1311-01AL
9	Check coolant and heating hoses as well as their connecting points	Check condition and coolant loss; replace coolant and heating hoses or their O-ring if required.
	Install
10	Unscrew tester cap (2) slowly from the expansion reservoir (1) and reduce overpressure
11	Remove pressure pump (3)
12	Check coolant level
	Notes on coolant level		AH20.00-P-1142-01CW
13	Screw cap onto expansion reservoir (1)
14	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	bar gauge	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