Check Main Circuit Coolant Level - AP20.30-P-2050E

Engine 177, 264, 274, 276, 642, 651, 654, 656 in model 253 

Shown on engine 274.9 in model 253.3 

Fig 1: Coolant Expansion Reservoir Component Location - Engine 274.9

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).	If the coolant level is above the light-dark boundary, ↓ coolant level correct, check complete, no further operations steps necessary. If the coolant level is below the light-dark boundary, ↓ check coolant level in coolant expansion reservoir (2), continue with operation step 2.
	Remove
2	Unscrew the cap (1) of the coolant expansion reservoir (2).
	Check
3	Check coolant level.	With a cold engine, the coolant level must reach the marking (arrow) in the coolant expansion reservoir (2). When the coolant is warm: approx. 1 cm (0.39 inch) above the marking (arrow). If the coolant level is too low, ↓ Check cooling system for leak tightness and coolant for antifreeze content.
		Coolant specifications After obtaining special order.	BB00.40-P-0310-01A
	Install
4	Seal coolant expansion reservoir (2) with cap (1).