Mercedes S-Class W-220

since 1998 release

Repair and operation of the car


Mercedes W220
+ Mercedes-Benz cars of the class S (W220)
+ Operation manual
+ Routine maintenance
+ Engine
+ Cooling system and heating
- Power supply system and release
   + Power supply system and fuel injection
   - System of injection of fuel of the diesel engine. Turbocompressor
      Checks of system of injection of fuel
      Turbocompressor - the general information, removal and installation
      The intercooler - the general information
   + Systems of release and decrease in toxicity of the fulfilled gases
+ Engine electric equipment
+ Automatic transmission
+ Power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
+ Schemes of electric equipment



The intercooler - the general information

Cooling of the blown air

2 — the Broad tank of cooling liquid
110/2 — the Intercooler
110/10 — the Cooler of low temperature
110/11 — the Additional cooler of low temperature
B17/8 — the Sensor of temperature of the forced air
B28/8 — the Sensor of pressure of the forced air

M44 — the Circulation pulser of a cooler of the forced air
And — Return of cooling liquid
In — Supply of cooling liquid
With — the Hose of expansion of cooling liquid
D — the Line of ventilation of a broad tank of cooling liquid


The intercooler in fact is the heat exchanger intended for decrease in temperature of the air passing through it.

Air, contracting in the compressor, heats up. At the same time the partial pressure of oxygen falls. For prevention of it, the intercooler after which the cooled air comes to the inlet pipeline is used.

Compressed air comes not to the inlet pipeline (as on ordinary diesel engines), and in the intercooler. The intercooler is located in a forward part of a motive compartment and is cooled with the liquid banished through radiators in a forward part of a motive compartment. The intercooler looks as well as a radiator of the cooling system. From the intercooler air moves in the inlet pipeline.

Thanks to cooling of the forced air filling of cylinders increases, and thanks to decrease in temperature of the fulfilled gases content of nitrogen oxides in them is reduced.

The radiator of the forced air (110/2), radiator of OZh (110/10) and the electric pump (M44) enters a separate working contour of the intercooler. Also additional radiator is established (110/11).

Warmed when tightening in the compressor the air forced in the engine is banished through a radiator (110/2) in which gives a part of heat of cooling liquid of the engine. Heat removal from cooling liquid is in turn made in a radiator (110/10) then liquid is forced by the pump (M44) in the intercooler again.

Physical parameters of an air stream (temperature and pressure) are measured below the intercooler on a stream and results of measurements are transferred to ECM (N3/10).

Activation of the pump of the intercooler is made by means of the individual relay placed in a box of the relay and safety locks of the engine (K40/8kW).