Engine cooling system - check fluid level, adjust to correct level. Inspect anticorrosion/antifreeze protection, adjust to correct concentration - AP20.00-P-2010GY

ENGINES 642 in MODEL 461 

ENGINES 273, 642 in MODEL 463 

Left figure: Model 461 Right figure: Model 463 

Fig 1: Identifying Coolant Expansion Reservoir And Cap

Courtesy of MERCEDES-BENZ USA

	Check
	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	Open coolant expansion reservoir (2)	Slowly screw open end cover (1) and release pressure, then unscrew end cover (1).
2	Using an antifreeze tester, check that coolant contains sufficient anticorrosion agent and antifreeze	If the mixing ratio is incorrect, correct the coolant composition: ↓Drain/fill in coolant
		Model 461 Model 463 with engine 273 Model 463 with engine 642 Use only approved anticorrosion and antifreeze agents. Antifreeze tester (refractometer)	AR20.00-P-1142GX
		Mixture ratio for coolant	*BF20.00-P-1001-04A
	Notes on coolant		AH20.00-N-2080-01A
3	Check coolant level and correct if necessary
	Notes on coolant level	In the event of fluid loss which is not due to normal consumption ↓	AH20.00-P-1142-01V
		Cooling and heating system - Check condition of radiator, lines and hoses	AP20.00-P-2050G
4	Close coolant expansion reservoir (2) with cap (1)

MIXTURE RATIO FOR COOLANT

Number	Designation			ENGINE all
BF20.00-P-1001-04A	Mixture ratio for coolant	Antifreeze/water	Up to -37°C	50/50
			up to -45°C	55/45
		Specifications for service products	Sheet	BB00.40-P-0310-01A
			Sheet	BB00.40-P-0325-00A