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

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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: Locating Coolant Expansion Reservoir Cap - Shown On Model 176
G10037910Courtesy of MERCEDES-BENZ USA
DANGER 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
NOTES Notes on coolant   AH20.00-N-2080-01A
INSPECT 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.
 
REMOVING Remove     
2 Unscrew cap (1) for coolant expansion reservoir (2) For an incorrect coolant level.  
INSPECT Check     
3 Check coolant level For an incorrect coolant level.
IMPORTANT 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.
 
REFER TO CAPACITIES & SPECIFICATIONS Coolant specifications Coolant (Specification 310.1). See https://bevo.mercedes-benz.com/index.php?language_id=1
INSTALLING Install     
4 Seal coolant expansion reservoir (2) with cap (1) For an incorrect coolant level.