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Home >> Mercedes Benz >> 2020 >> S450 Base >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Cooling Systems >> Engine Cooling System - 222 Chassis (2 Of 2) >> Maintenance >> Check Main Circuit Coolant Level - AP20.30-P-2050HA

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

Engine 157, 176, 177, 256.9, 264, 276, 277, 278, 279, 642, 651, 656 in model 222 

Engine 157, 176, 177, 276.8, 278, 279 in model 217 

G15359687Courtesy of MERCEDES-BENZ USA

Shown on engine 256.9 in model 222.1 

Shown on engine 651.9 in model 222.0 

G15359688Courtesy of MERCEDES-BENZ USA
WARNING 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
REMOVING Remove     
1 Remove trim from engine compartment at front right (3).    
INSPECT Check     
2 Check coolant level in light-dark boundary area of coolant expansion reservoir (2). For coolant expansion reservoirs (2) with transparent tank lower part.
If the coolant level is above the light-dark boundary,

Coolant level correct, check completed, continue with operation step 6.
If the coolant level is below the light-dark boundary,

Check coolant level in coolant expansion reservoir (2), continue with operation step 3.
 
REMOVING Remove     
3 Unscrew the cap (1) of the coolant expansion reservoir (2).    
INSPECT Check     
4 Check coolant level. IMPORTANT With a cold engine, the coolant level must reach the marking (arrow) in the coolant expansion reservoir (2). When the coolant is warm: approx. 1 cm (0.39 inch) above the marking (arrow).
If the coolant level is too low,

Check coolant for leak tightness and check coolant for antifreeze content subject to separate repair order.
 
REFER TO CAPACITIES & SPECIFICATIONS   Coolant specifications BB00.40-P-0310-01A
INSTALLING Install     
5 Seal coolant expansion reservoir (2) with cap (1).    
6 Install right front engine compartment trim (3).