Charge air cooling system, function - GF09.41-P-3104AM

ENGINE 113.990 in MODEL 211, 219

ENGINE 113.991 in MODEL 215, 220

ENGINE 113.992 in MODEL 230 up to Model Year 2008

ENGINE 113.993 in MODEL 463 up to 31.5.12

ENGINE 113.995 in MODEL 230 up to Model Year 2008

Charge air cooling system models 211, 219

Fig 1: Identifying Charge Air Cooling System Function Diagram

Courtesy of MERCEDES-BENZ USA

Charge air cooling system models 220, 463

Fig 2: Identifying Charge Air Cooling System Function Diagram

Courtesy of MERCEDES-BENZ USA

Charge air cooling system models 215, 230

Fig 3: Identifying Charge Air Cooling System Function Diagram

Courtesy of MERCEDES-BENZ USA

Due to the charge air cooling, the volumetric efficiency of the cylinder is improved and reduces the level of NO_X emissions.

The charge air cooling has a separate coolant circuit (low-temperature cooling circuit) which consists of the following components:

Charge air cooler
Low-pressure cooler
Additional low temperature cooler (only for models 220, 463)
Charge air cooler circulation pump

The charge air cooler circulation pump is actuated by the ME-SFI [ME] control unit (N3/10) via the following relay:

Models 211, 219 Charge air cooler circulation pump relay (N10/2kA)

Model 215, 220 Charge air relay (K40/8kW)

Model 230 Charge air cooler circulation pump relay (K40/5kR)

Model 463 Charge air cooler circulation pump relay (K61)

Function

The suctioned air warms up due to the charging process. The charge air gives up its heat to coolant in the charge air cooler which is located directly after the compressor.

The coolant is subsequently cooled in the low temperature cooler and the coolant is pumped back by charge air cooler circulation pump to the charge air cooler where the coolant circulation starts again.

The charge air temperature and charge air pressure are measured after the charge air cooler and the measurements are sent to the ME control unit.

	Pressure sensor, location/task/design/function		GF07.04-P-5014AM
	Charge air temperature sensor, location/task/design/function		GF07.04-P-5039AM
	ME-SFI control unit, location/task/design/function		GF07.61-P-5000AM
	Charge air cooler Location/task/design/function		GF09.41-P-3100AM
	Charge air cooling circulation pump Location/task/function		GF09.41-P-3102AM
	Low-pressure cooler Location/task/function		GF09.41-P-3103AM
	Charge air cooling circulating pump relay Location/task/design/function		GF09.41-P-3106AM