Check Engine Cooling System For Leaktightness - AR20.00-P-1011MNO

Engine 176 In Model 167 

Engine 177 In Model 167 

Shown on model 167 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	Switch on ignition.
2	Adjust heater to maximum heat output.
3	Remove upper engine cover.
		Engine 176 in model 167	AP01.10-P-2405-01M
		Engine 177 in model 167	AP01.10-P-2405-01E
4	Remove lower engine compartment paneling.		AR61.20-P-1105ME
5	Remove the cap (1) on the coolant expansion reservoir (2).
	Check
6	Check coolant level and antifreeze content of the coolant; correct if necessary.	Engine 176 in model 167Cooling system	*BF20.00-P-1001-06A
		Engine 177 in model 167Cooling system	*BF20.00-P-1001-02LA
7	Install tester cap (3) on coolant expansion reservoir (2).	Test cap	Fig 1
8	Connect pressure pump (4) at tester cap (3).	Pressure pump	Fig 2
9	Apply a test pressure to the engine cooling system for 2 minutes.	Do not exceed the specified test pressure. Damage will occur otherwise to the engine cooling system. There should be no pressure loss within a period of 2 minutes. Test pressure for pressure-testing the cooling system	*BE20.30-P-1002-01D
10	Visually check the condition of the coolant-conducting component parts and the connections and check them for coolant loss.	If pressure loss is present: ↓ Replace damaged assembly part.
11	Drain off overpressure via valve at pressure pump (4).	Pressure pump	Fig 2
12	Disconnect pressure pump (4) from tester cap (3).	Pressure pump	Fig 2
13	Detach tester cap (3) from coolant expansion reservoir (2).	Test cap	Fig 1
14	Check coolant level and antifreeze content of the coolant; correct if necessary.	Engine 176 in model 167Cooling system	*BF20.00-P-1001-06A
		Engine 177 in model 167Cooling system	*BF20.00-P-1001-02LA
	Install
15	Attach cap (1) to coolant expansion reservoir (2).
16	Install lower engine compartment lining.		AR61.20-P-1105ME
17	Install upper engine cover.
		Engine 176 in model 167	AP01.10-P-2405-01M
		Engine 177 in model 167	AP01.10-P-2405-01E
18	Switch off ignition.

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