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

ENGINE 112, 113, 156, 271, 272, 273, 628, 629, 642, 646, 647, 648 in MODEL 211

ENGINE 113, 271, 272 in MODEL 171

ENGINE 133, 270, 607, 651 in MODEL 117, 176

ENGINE 133, 270, 607, 651 in MODEL 156

ENGINE 157, 276, 278, 279 in MODEL 231

ENGINE 270 in MODEL 242

ENGINE 270, 607, 651 in MODEL 246

Shown on MODEL 176

Fig 1: Coolant Expansion Reservoir & Cap - Shown On Model 176

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	Check coolant level in light-dark boundary area of coolant expansion reservoir (2)	For coolant expansion reservoirs (2) with transparent tank lower part. Coolant level below light-dark boundary: ↓ Coolant level incorrect, continue with operation step 2. Coolant level above light-dark boundary: ↓ Coolant level correct.
	Remove
2	Unscrew cap (1) for coolant expansion reservoir (2)	For an incorrect coolant level.
	Check
3	Check coolant level	For an incorrect coolant level. The coolant level on a cold engine must reach up to the marking (arrow) in the coolant expansion reservoir (2). 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.
	Check coolant level	Coolant specifications	Coolant (Specification 310.1). See https://bevo.mercedes-benz.com/index.php?language_id=1
	Install
4	Seal coolant expansion reservoir (2) with cap (1)	For an incorrect coolant level.