Regulated Engine Cooling Fan Operation; A/C System Diagram - BMW 1999-2005 M3 Service Manual

Heating and Air Conditioning
A/C system
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signal to the ECM enables the ECM to
modify the idle speed, timing and fuel
injection amount based on the load that
is imposed when the compressor is
activated.
Regulated engine cooling fan
operation
The engine cooling fan (arrow) operates
at variable speeds (15 stages) based on
cooling system load. The ECM activates
the fan through a pulse modulated final
stage control. See
Cooling System for further details.
Note:
Automatic transmission models: The
engine cooling fan is located in front
of the radiator. A belt-driven fan and
fan clutch assembly is installed at
the rear of the radiator.
Standard transmission models: The
electric engine cooling fan is
installed at the rear of the radiator.
170 Radiator and
2/25/2009 11:16 PM