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

Engine 176, 177, 256, 279, 656 in model 223 

Shown on engine 656.9 in model 223.130 

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
	Risk of injury  from engine start by remote start function	Prior to starting work, open engine hood, do not reach into rotation range or hazard area of freely rotating parts, wear closed and snug-fitting work clothes	AS00.00-Z-0024-01A
Notice	Notes on coolant		AH20.00-P-2080-01KOA
	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 coolant is warm: approx. 1 cm (0.39 inch) above marking. 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).