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

ENGINE 113, 156, 272, 273, 276, 642 in MODEL 251 

ENGINE 113, 156, 272, 273, 629, 642 in MODEL 164.1 

Fig 1: Locating Coolant Expansion Reservoir Cap

Courtesy of MERCEDES-BENZ USA

	Remove
1	Switch off ignition
2	Open engine hood
		MODEL 164	AR88.40-P-1000GZ
		Model 251	AR88.40-P-1000RT
	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
3	Unscrew cap (1) for coolant expansion reservoir (2)
	Check
4	Check coolant level
	Notes on coolant		AH20.00-N-2080-01A
		The coolant level must, on a cold engine, reach up to the marking (arrow) in the coolant expansion reservoir. When the coolant is warm, about 1 cm 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
5	Seal coolant expansion reservoir (2) with cap (1)
6	Close engine hood
		MODEL 164	AR88.40-P-1000GZ
		Model 251	AR88.40-P-1000RT