Notes on coolant - AH20.00-N-2080-01A

All engines 

Coolant composition 

Passenger car and commercial vehicle engines (normally):

50% water by volume and

50% anticorrosion/antifreeze agent by volume.

Different coolant composition for CV engines, refer to MB Specifications for Operating Fluids. 

Tasks of anticorrosion/antifreeze agent 

• Corrosion and cavitation protection for all components in cooling system
• Antifreeze protection (frost protection)
• Increase the boiling point so that coolant does not evaporate so rapidly. Avoiding ejection of coolant at high coolant temperatures.

Antifreeze protection 

50% anticorrosion/antifreeze agent by volume provides antifreeze protection down to approx. -37°C  . A higher concentration is only necessary if the ambient temperatures are even lower. 55% anticorrosion/antifreeze agent by volume provides antifreeze protection down to approx. -45°C  .

A concentration of more than 55% anticorrosion/antifreeze agent by volume should not be used as the maximum antifreeze protection is already reached at this concentration. An even higher concentration once reduces antifreeze protection and impairs heat dissipation. Reduced heat dissipation can result in damage to components of the cooling system and to the engine.

Water 

Use water which is clean and not too hard. Drinking water often satisfies requirements, but not always The amount of dissolved substances in the water may be of significance for the occurrence of corrosion. If in doubt, analyze the water.

For fresh water specifications refer to MB Specifications for Operating Fluids. 

Period of use 

The maximum permissible period of use of the coolant is given in the maintenance booklet, the applicable "Service/Maintenance Sheet" or the MB-Specifications for Operating Fluids. 

For the period of use for a varying coolant composition for CV engines, refer to MB Specifications for Operating Fluids. 

Before pouring in fresh coolant, flush the used coolant out of the cooling system. In the case of severe fouling by dirt or oil, clean the cooling system otherwise components of the cooling system can be damaged.

If the drained coolant is reused, it is essential that the coolant be filtered before it is filled into the cooling system. No dirt particles may enter the cooling system, otherwise components of the cooling system may be damaged.

Disposing of coolants 

Observe the legal provisions and local waste water regulations