Engine Cooling System - Inspecting Fluid Level, Adjusting To Correct Level - AP20.00-S-2011E

Engine 254, 274 in model 447 

Engine 254, 274 in model 448 

Engine 622, 651, 654 in model 447 

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
Notice	Notes on coolant		AH20.00-P-2080-01KOA
	Notes on coolant level		AH20.00-P-1142-01CW
	Check
1	Switch off ignition.
2	Unscrew cap of coolant expansion reservoir.
3	Check for coolant corrosion and antifreeze protection.	Rectify corrosion inhibitor and antifreeze protection for coolant in line with findings report.
4	Check coolant level.	Coolant temperature must be ≤ 50°C.
	Service Information: Coolant	Engine 274 in model 447 with code ZL3 (National version for Latin America) Engine 274 in model 447 with code ZU7 (National version for Canada) Engine 274 in model 447 with code ZU8 (National version for USA) Engine 622, 651 in model 447 The coolant level on a cold engine must reach up to the marking (arrow) on the coolant expansion reservoir. For warm coolant the coolant level must be about 10 mm above the marking (arrow). If the coolant level is incorrect, ↓ Correct coolant level.	SI20.00-S-0001B
5	Screw cap back onto coolant expansion reservoir.