Check Low-Temperature Circuit For Leaktightness - AR09.41-P-1011MNL

Engine 176 in model 217, 222 

Engine 256 in model 222 

Shown on model 222 with engine 176 

Courtesy of MERCEDES-BENZ USA

	Risk of injury  to skin and eyes suffering scalding from contact with hot coolantspray. Risk of poisoning  from swallowing coolant.	Do not open cooling system unless coolant temperature is below 90°C. Open cap slowly and release the overpressure. Do not pour coolant into beverage containers. Wear protective gloves, protective clothing and safety glasses.	AS20.00-Z-0001-01A
Notice	Notes on coolant		AH20.00-P-2080-01KOA
	Notes on coolant level		AH20.00-P-1142-01CW
	Remove
1	Remove lower engine compartment paneling.		AR61.20-P-1105LF
2	Remove upper engine cover.	Engine 176 in model 217, 222
3	Remove the left upper engine compartment paneling.	Engine 256 in model 222
4	Remove cap (1).	The coolant temperature should be approx. 40°C.
	Check
5	Check coolant level and antifreeze content of coolant in low-temperature circuit and correct i necessary
		Engine 176 in model 217, 222	AP20.30-P-2052F
		Engine 256 in model 222	AP20.30-P-2052K
		Engine 256 in model 222 Cooling system	*BF20.00-P-1001-06MRT
		Engine 176 in model 217, 222 Cooling system	*BF20.00-P-1001-06A
6	Attach the tester cap (4) to the expansion reservoir for the low-temperature circuit (2).	Test cap	Fig 1
7	Connect the pressure pump (3) to the tester cap (4).	Pressure pump	Fig 2
8	Apply compressed air to the low-temperature circuit for 2 minutes.	Do not exceed the specified test pressure. Damage can occur otherwise on the low-temperature circuit.
		There should be no pressure loss within a period of 2 minutes.
		Engine 256 in model 222 Test pressure for pressure-testing the engine cooling system	*BE20.30-P-1005-01A
		Engine 176 in model 217, 222 Test pressure for pressure-testing the low-temperature circuit	*BE20.30-P-1001-01D
9	Perform a visual inspection on the assembly parts carrying coolant.	In the event of pressure loss in the low-temperature circuit, ↓ Check condition and coolant loss for all assembly part carrying coolant and connections and remove coolant loss if necessary using suitable measures.
10	Reduce the pressure at the pressure pump (3).	Pressure pump	Fig 2
11	Connect the pressure pump (3) to the tester cap (4).	Pressure pump	Fig 2
12	Remove the tester cap (4) from the expansion reservoir for the low-temperature circuit (2).	Test cap	Fig 1
13	Check the coolant level and antifreeze content of the coolant and correct if necessary
		Engine 176 in model 217, 222	AP20.30-P-2052F
		Engine 256 in model 222	AP20.30-P-2052K
		Engine 256 in model 222 Cooling system	*BF20.00-P-1001-06MRT
		Engine 176 in model 217, 222 Cooling system	*BF20.00-P-1001-06A
	Install
14	Attach the cap (1).
15	Install the left upper engine compartment paneling.	Engine 256 in model 222
16	Install upper engine cover.	Engine 176 in model 217, 222
17	Install lower engine compartment lining.		AR61.20-P-1105LF

Fig 1: Identifying Test Cap (210 589 00 91 00)

Courtesy of MERCEDES-BENZ USA

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

Courtesy of MERCEDES-BENZ USA