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Check coolant level in the coolant expansion reservoir - AP20.30-P-2050GA

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

Fig 1: Checking Coolant Level In Coolant Expansion Reservoir
G00544421Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
REMOVING Removing    
1 Switch off ignition    
2 Open engine hood   AR88.40-P-1000GZ
DANGER 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 
3 Unscrew cap (1) for coolant expansion reservoir (2)    
  Checking     
4 Check coolant level 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 leak-tightness and check coolant for antifreeze content subject to separate repair order.
 
NOTES Notes on coolant   AH20.00-N-2080-01A 
  Installing     
5 Seal coolant expansion reservoir (2) with cap (1)    
6 Close engine hood   AR88.40-P-1000GZ