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

ENGINE 274 in MODEL 172 

ENGINE 274 in MODEL 204 

ENGINE 274 in MODEL 207 

ENGINE 274 in MODEL 212 

ENGINE 274 in MODEL 218 

Shown on model 204.434 

Fig 1: Inspecting Cooling System For Leaks - Shown On Model 204.434

Courtesy of MERCEDES-BENZ USA

	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 pressure. Do not pour coolant into beverage containers. Wear protective gloves, protective clothing and safety glasses.	AS20.00-Z-0001-01A
	Notes on coolant		AH20.00-N-2080-01A
	Check
1	Adjust heater to maximum heat output
2	Unscrew cap (1) slowly at expansion reservoir (2) and relieve overpressure
3	Check coolant level and antifreeze content coolant
	Notes on coolant level		AH20.00-P-1142-01MR
		Coolant mixing ratio In a case of the antifreeze content of the coolant being too low: ↓ Add antifreeze or replace the coolant.	*BF20.00-P-1001-04A
4	Screw on tester cap (3) at the expansion reservoir (2)	Test cap	Figure
5	Connect pressure pump (4) at test cap (3)	Pressure pump	Figure
6	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 loss of pressure within a period of 2 minutes.
		Engine 274 in model 204 2-stage cover latch Test pressure for pressure-testing the engine cooling system In the event of pressure loss: ↓ Perform a visual inspection on the components carrying coolant.	*BE20.30-P-1005-01A
7	Remove test pressure in the cooling system	To do this actuate pressure relief button on the pressure pump (4).
		Pressure pump	Figure
8	Detach pressure pump (4) on tester cap (3)	Pressure pump	Figure
9	Unscrew tester cap (3) at the expansion reservoir (2)	Test cap	Figure
10	Check coolant level and antifreeze content of coolant and correct if necessary	Coolant mixing ratio	*BF20.00-P-1001-04A
11	Screw cap (2) onto low-temperature circuit coolant expansion reservoir (1)

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