Notes On Coolant - AH20.00-P-2080-01KOA

Engine 100, 102, 103, 104, 110, 111, 112, 113, 114, 115, 116, 117, 119, 120, 121, 123, 127, 129, 130, 133, 137, 139, 152, 155, 156, 157, 159, 166, 176, 177, 178, 180, 254, 256, 260, 264, 266, 270, 271, 272, 273, 274, 275, 276, 277, 278, 279, 282, 285, 601, 602, 603, 604, 605, 606, 607, 608, 611, 612, 613, 615, 616, 617, 621, 626, 628, 629, 640, 642, 646, 647, 648, 651, 654, 656, 668, 780.001/20/990/996/998 

Engine 780 in model 295, 296, 297 

Engine 780.991 in model 169.090 

Engine all (4xWD, Heavy transporter, Light transporter, smart) 

Coolant composition 

Car and commercial vehicle engines (normal case):

50 % water and 50 % anticorrosion/antifreeze agent.

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

Coolant composition OM 607 or M 200 in model 415 

Hot countries:

60 % water and 40 % anti-corrosion agent/antifreeze.

Cold countries:

50 % water and 50 % anticorrosion/antifreeze agent.

On model 415 the anti-corrosion or antifreeze agent Arteco ETX 9536 B (fluorescent yellow) is used in the factory. With this anti-corrosion/antifreeze, the antifreeze protection configured at the factory will change in comparison to previous Mercedes-Benz van model series. Antifreeze protection is set in a range between -25°C and -37°C ex factory and does not need to be adjusted. This results in a different coolant composition. Observe MB-Specifications for Operating Fluids  .

Coolant composition M 178 in model 190.381 Black Series 

60 % water and 40 % anti-corrosion agent/antifreeze.

On engine 178 in model 190.381 Black Series, a deviation is made from the usual coolant composition (50 % anti-corrosion or antifreeze agent 50 % water). In all other model 190 vehicles with engine 178, the coolant composition is still 50 % anti-corrosion or antifreeze agent 50 % water. This results in a different coolant composition. Observe MB-Specifications for Operating Fluids  .

Tasks of anticorrosion/antifreeze agent 

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

Antifreeze 

An anti-corrosion/antifreeze concentration of 50 % provides antifreeze protection up to approx. -37°C  . A higher concentration is only necessary if the ambient temperatures are even lower. An anti-corrosion/antifreeze concentration of 55 % provides antifreeze protection up to approx. -45°C  .

For model series 415 with OM 607 or M 200, the factory-adjusted anti-corrosion/antifreeze concentration is 40 % (hot countries) or 50 % (cold countries). This provides antifreeze protection up to -25°C  or up to -37°C  .

Anti-corrosion/antifreeze concentrations of more than 55 % are not to be used as the maximum antifreeze protection is already reached at this concentration.

An even higher concentration reduces the anti-freeze protection and impairs heat dissipation. Reduced heat dissipation can result in damage to components of the engine cooling system and to the engine.

Coolant Ready-Mix 

• All conventional coolants approved as ready-mix are already mixed with water and must not be further mixed  with water.
• The coolant approved for the fuel cell cooling circuit is only to be used as a ready-mix. The coolant must not  be further mixed with water. This ensures suitable, low electrical conductivity.

Water 

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

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

Replacement of a component part in the coolant circuit/Installation of a new component part 

When installing a new metallic component part in the coolant circuit that comes into contact with the coolant (e.g. cooler, heater core, charge air cooler), the drained quantity of coolant must be disposed of and replaced with fresh coolant. Otherwise, vehicles may be damaged due to faulty anti-corrosion protection, which may result in a total loss in economic terms. Coolant that has not been drained off may remain in the cooling circuit.

For other components (hoses, etc.) and components with small metallic surfaces (temperature sensor, thermostat, fitting, etc.), the coolant may be collected in a new can and added again.

Storage of a removed component part 

If a metallic component part of the coolant circuit is removed and reinstalled during replacement, it is recommended that this component part be stored unfilled for no longer than 3 days  because otherwise severe corrosion will occur. This can lead to corrosion inhibitors no longer being able to protect these metallic surfaces even once they are filled with fresh coolant.

Along with the removed parts, the still open cooling circuit on the vehicle must also be sealed off or, where possible, filled with coolant If such removed or retained metallic component parts remain wet and drained for longer than 3 days, they must then be either fully drained or, where possible, completely filled with fresh coolant. The connections of these components must be air-sealed shut during replacement. This reduces the speed of the corrosion.

Operational monitoring of coolant 

Inspect the coolant for resistance to low temperatures before the start of the cold season.

In countries with high ambient temperatures, check concentration of anti-corrosion/antifreeze agent once a year.

The corrosion protection in the coolant is depleted during operation. Old coolant, in which the corrosion protection is mainly depleted, is extremely corrosive.

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

Before pouring in fresh coolant, flush the used coolant out of the engine cooling system.

In case of severe soiling or oil fouling, clean engine cooling system.

Otherwise engine cooling system components may be damaged.

If the drained coolant is used again, it is essential that the coolant is filtered before being filled into the engine cooling system.

Dust particles must not enter into the engine cooling system.

Otherwise engine cooling system components may be damaged.

Disposing of coolants 

Observe the legal provisions and local waste water regulations.

The following brochure is available about disposing of waste products in auto repair trade for the location Federal Republic of Germany:

Environmental protection manual for motor vehicle repair operations Publisher: German Association of the Automotive Industry e. V. (VDA) 10117 Berlin, Behrenstrasse 35