2001 BMW 325i SEDAN climate control

102n
Automatic climate control
*
Rear window defroster
When the rear window defroster
is activated, the indicator lamp
comes on. The rear window defroster
switches off automatically. Refer to
page 71.
Draft-free ventilation Set the ventilation outlets for your upper
body area so that it is comfortable for
you:
Use rotary dials (1) to open and close
the air outlets through an infinitely-vari-
able range. You can adjust the direction
of the airflow with the levers (2).
Set the outlets so that the air flows past
you and is not directed straight at you.
The rotary dial (3) allows you to mix the
air from the outlets for your upper body
by warming or cooling the air as
desired.460de040
Microfilter/Activated-charcoal
filterThe microfilter traps incoming dust and
pollen. The activated-charcoal filter
helps clean the incoming outside air of
gaseous pollutants. Your BMW center
will replace this combinated filter during
the regularly scheduled maintenance. A
substantial reduction in air supply indi-
cates that the filter must be replaced
before normal maintenance.
For additional information on the filter
change, refer to page 171.

126n
To maintain good handling and vehicle
response, use only tires of a single
tread configuration from a single manu-
facturer. BMW tests and approves
wheel/tire combinations, beginning on
page 130.
DOT Quality GradesTreadwear
Traction AA A B C
Temperature A B C
All passenger vehicle tires must
conform to Federal Safety
Requirements in addition to these
grades. rating based on the wear rate of the tire
when tested under controlled condi-
tions on a specified government test
course.
For example, a tire graded 150 would
wear one and one-half (1g) times as
well on the government course as a tire
graded 100. The relative performance
of tires depends upon the actual condi-
tions of their use, however, and may
depart significantly from the norm due
to variations in driving habits, service
practices and differences in road char-
acteristics and climate.
TractionThe traction grades, from highest to
lowest, are AA, A, B and C.
Those grades represent the tire's ability
to stop on wet pavement as measured
under controlled conditions on speci-
fied government test surfaces of
asphalt and concrete. A tire marked C
may have poor traction performance.
The traction grade assigned to
this tire is based on straight-
ahead braking traction tests, and does
not include acceleration, cornering,
hydroplaning, or peak traction charac-
teristics. highest), B and C, representing the
tire's resistance to the generation of
heat and its ability to dissipate heat
when tested under controlled condi-
tions on a specified indoor laboratory
test wheel.
Sustained high temperature can cause
the material of the tire to degenerate
and reduce tire life, and excessive
temperature can lead to sudden tire
failure. The grade C corresponds to a
level of performance which all
passenger vehicle tires must meet
under the Federal Motor Vehicle Safety
Standard No. 109. Grades B and A
represent higher levels of performance
on the laboratory test wheel than the
minimum required by law.
The temperature grade for this tire
is established for a tire that is
properly inflated and not overloaded.
Excessive speed, underinflation, or
excessive loading, either separately or
in combination, can cause heat buildup
and possible tire failure. applicable on the tire sidewall between
tread shoulder and maximum section
width. For example:
Treadwear 200 Traction AA
Temperature A
Do not use retreaded tires. Driving
safety may be impaired by their
use. This is due to the possible varia-
tions in casing structures and, in some
cases, to their extreme age, factors that
can lead to a decrease in their dura-
bility.<
Tire replacement

187n
IndexDataTechnologyRepairsCar careControlsOverview
Self-diagnostics All of the important electrical and elec-
tronic systems in the vehicle are tested
regularly and automatically Ð the driver
does not have to perform any extra
operations or adjustments.
The indicator lamps also come on
briefly after the ignition has been turned
on.
While you are driving, the functional
status of the actuator motors (for the
windshield wipers, power windows,
seats, sliding/tilt sunroof, etc.) is
constantly analyzed by current
measurements in their relays.460de177
In the same manner, the electrical
resistance of the airbag ignition genera-
tors and all of the remaining airbag
components is measured at all times.
Any fault in this system would be
detected immediately by a current fluc-
tuation that would necessarily accom-
pany it. The fault would be indicated
immediately by the airbag warning
lamp.
Even after you shut off the engine, the
overall functional status of your vehicle
is monitored. For example, all of the
flaps of the heating and ventilation
system travel to the nearest limit posi-
tion. This ensures that the defrost func-
tion is always available even if a
malfunction in the air conditioner
system/automatic climate control
should occur while the vehicle is
parked overnight, for instance.
A calibration cycle runs every tenth time
the engine is shut off. During this cycle,
the actuator motors of all the heating
and ventilation flaps travel to their limit
stops in both directions. The limit posi-
tions and the return travel paths are
checked in this manner in order to
ensure that appropriate adjustments for
the operating elements can be made at
any time.You will hear the sounds of the air flaps
as the air conditioning system/auto-
matic climate control carry out their
self-diagnostic functions after the igni-
tion has been turned off. All of the other
self-diagnostics functions operate
silently in the background.
Any possible faults detected during
these self-diagnostics can be read out
by your BMW center during the next
regularly-scheduled maintenance and
corrected with a minimum of time.

Everything from A to ZA
ABS (Antilock Brake
System)22,118
Accessories6
Activated-charcoal
filter102,171
Adaptive Transmission
Control (ATC)66,178
Adding engine oil139
Adding washer
fluid138,195
Adjusting the backrest48
Adjusting the steering
wheel51
Adjusting the
temperature94
Adjusting the thigh support
area49
Air conditioner92
Air distribution94,100
Air nozzles92,98
Air outlets92,98
ventilation92,98
Air pressure125
Air supply94,101
Airbags21,55,151,179
Alarm system42
Antenna124
Antenna, Diversity181
Antifreeze142
radiator122 Antilock Brake System
(ABS)22,118
Anti-theft alarm system42
Aquaplaning117,125
Armrest105
ASC+T (Automatic Stability
Control plus Traction)22
Ashtray107
front107
rear108
ATC (Adaptive Transmission
Control)66,178
Attach car vacuum
cleaner108
AUC (Automatic
recirculated-air
control)101
Automatic car washes146
Automatic climate
control98
removing condensation
from the windows101
Automatic cruise control72
Automatic dimming, interior
rearview mirror53
Automatic recirculated-air
control (AUC)101
Automatic Stability Control
plus Traction (ASC+T)22
Automatic transmission with
Steptronic21,66 Automatic windshield
washer70
Average consumption78
Average speed78
Axle loads194
B
Backrest, adjusting48
Backup lamps65
bulb replacement161
Battery168,196
capacity196
charge170
discharged173
removal and
installation169
Battery charge current20
Battery safety terminal169
Belts54
Beverage holder105
Blower94,101
BMW High Performance
Synthetic Oils140
BMW sports seat49
Bore192
Brake fluid143
Brake hydraulic system20
Brake lamps, bulb
replacement161
Brake pads22
Brake system121 Brakes120
malfunctions121
Break-in procedures116
Bulb replacement158
C
California Proposition
65 Warning153
Capacities195
Car Memory53
Car radio124
refer also to the separate
Owner's Manual
Car radio
reception124,181
Car vacuum cleaner,
connecting108
Car wash146
Care
exterior147
interior150
Care of upholstery150
Care of wool velour150
Cargo loading112
Caring for the vehicle
finish148
Catalytic converter117
CBC (Cornering Brake
Control)21,119
Cellular phone107,124
refer also to the separate
Owner's Manual
A-Z