Check main circuit coolant level - AP20.30-P-2050HA

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ENGINE 157, 276, 277, 278, 279, 642, 651 in MODEL 222

ENGINE 157, 278, 279 in MODEL 217

Shown on ENGINE 651 in MODEL 222

Fig 1: Locating Coolant Expansion Reservoir Cap (Engine 651)

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 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
	Remove
1	Remove cover from engine compartment at front right
2	Unscrew cap (1) for coolant expansion reservoir (2)
	Check
3	Check coolant level	The coolant level on a cold engine must reach up to the marking (arrow) in the coolant expansion reservoir. When the coolant is warm, about 1 cm (0.39 inch) above the marking (arrow). If coolant level is too low: ↓ Check coolant for leaktightness and check coolant for antifreeze content subject to separate repair order.
	Install
4	Seal coolant expansion reservoir (2) with cap (1)
5	Install cover for engine compartment at front right