Notes on coolant - AH20.00-N-2080-01A
All engines
Coolant composition
passenger car and commercial vehicle engines (normally)
50 water in % by volume and 50 corrosion/antifreeze agent in % by volume.
Different coolant composition for CV engines, refer to MB Specifications for Operating Fluids
Tasks of corrosion and frost protection
- Corrosion and cavitation protection of 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 % by volume of anticorrosion/ antifreeze agent offers antifreeze protection down to approx. -37 °C . A higher concentration is only necessary if the ambient temperatures are even lower. 55 % by volume of anticorrosion/antifreeze agent offers antifreeze protection down to approx. -45 °C
A concentration of more than 55 % by volume of anticorrosion/ antifreeze agent should not be used as the maximum antifreeze protection is already reached. An even higher concentration once reduces antifreeze protection and impairs heat dissipation. Reduced heat dissipation can lead to damage to components in the cooling system or damage to the engine.
Water
Use water which is clean and not too hard. Drinking water often satisfies requirements, but not always the contents 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 can be taken from the maintenance booklet; from the applicable service/ maintenance sheet or the MB-Specifications for Operating Fluids respectively.
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 event of high pollution or oil fouling levels, clean the cooling system, otherwise damage can occur to the components of the cooling system.
Disposing of coolants
Pay attention to legal provisions and local wastewater regulations.
For workshops located in the Federal Republic of Germany refer to: "Environmental Protection Manual for Automotive Repair Workshops"
Publisher: Association of Automotive Industry e.V. (VDA)
60625 Frankfurt am Main, Westendstrab 61