2004 SUBARU IMPREZA air conditioning

3-46
Instruments and controls
detect it and make the reflection surface of the mirror
dimmer to help prevent you from being blinded. For
this reason, use care not to cover the sensors with
stickers, or other similar items. Periodically wipe the
sensors clean using a piece of dry soft cotton cloth or
an applicator. "
Compass calibration
1. For optimum calibration, switch off all nonessential
electrical accessories (rear window defogger, heater/
air conditioning system, spotlight, etc.) and ensure all
doors are shut.
2. Drive to an open, level area away from large metal-
lic objects or structures and make certain the ignition
switch is in the “ON” position.
3. Press and hold the left button for 3 seconds then re-
lease, and the compass will enter the calibration
mode. “CAL” and direction will be displayed.
4. Drive slowly in a circle until “CAL” disappears from
the display (about two or three circles). The compass
is now calibrated.
5. Further calibration may be necessary should out-
side. Influences cause the mirror to read inaccurately.
You will know that this has occurred if your compass
begins to read in only limited directions. Should you
encounter this situation, return to step one of the
above procedure and recalibrate the mirror. "
Compass zone adjustment
Compass calibration zones
1. The zone setting is factory preset to Zone 8. Refer
to the “Compass calibration zone” map shown above
or one attached to the end of this manual to verify that
the compass zone setting is correct for your geograph-ical location.
2. Press and hold the right button for 3 seconds then
release, and the word “ZONE” will briefly appear and
then the zone number will be displayed.
3. Press the right hand button repeatedly to cycle the
display through all possible zone settings. Stop cycling
when the correct zone setting for your location is dis-
10
9
8
7
6
5
4
3
1112
13
HGF048AA

4-1
4
Climate control
Ventilator ....................................................... 4-2 Air flow selection .............................................. 4-2
Center and side ventilators .............................. 4-3
Manual climate control system (if equipped) 4-4 Control panel ..................................................... 4-4
Heater operation ............................................... 4-6
Air conditioner operation (if equipped) .......... 4-9
Semi-automatic climate control system (if equipped) ............................................... 4-11Control panel ..................................................... 4-11
Operating method ............................................. 4-14
Temperature sensors ....................................... 4-18
Operating tips for heater and air conditioner 4-19 Cleaning ventilation grille ................................ 4-19
Efficient cooling after parking in direct sunlight ........................................................... 4-19
Lubrication oil circulation in the refrigerant
circuit .............................................................. 4-19
Checking air conditioning system before summer season .............................................. 4-19
Cooling and dehumidifying in high humidity and low temperature weather conditions .... 4-20
Air conditioner compressor shut-off when
engine is heavily loaded ................................ 4-20
Refrigerant for your climate control system .. 4-20
Air filtration system (if equipped) ................ 4-20 Replacing an air filter ....................................... 4-21

4-19
Climate control
– CONTINUED –
Operating tips for heater and air con-
ditioner !Cleaning ventilation grille
Always keep the front ventilation inlet grille free of
snow, leaves, or other obstructions to ensure efficient
heating and defrosting. Since the condenser is located
in front of the radiator, this area should be kept clean
because cooling performance is impaired by any ac-
cumulation of insects and leaves on the condenser. !
Efficient cooling after parking in direct
sunlight
After parking in direct sunlight, drive with the windows
open for a few minutes to allow outside air to circulate
into the heated interior. This results in quicker cooling
by the air conditioner. Keep the windows closed during
the operation of the air conditioner for maximum cool-
ing efficiency. ! Lubrication oil circulation in the refrig- erant circuit
Operate the air conditioner compressor at a low en-
gine speed (at idle or low driving speeds) a few min-
utes each month during the off-season to circulate its
oil. ! Checking air conditioning system be-
fore summer season
Check the air conditioner unit for refrigerant leaks,
hose conditions, and proper operation each spring.
This check is best performed by your SUBARU dealer.
UG4040BA

4-20
Climate control
!
Cooling and dehumidifying in high hu-
midity and low temperature weather
conditions
Under certain weather conditions (high relative humid-
ity, low temperatures, etc.) a small amount of water
vapor emission from the air outlets may be noticed.
This condition is normal and does not indicate any
problem with the air conditioning system. ! Air conditioner compressor shut-off
when engine is heavily loaded
To improve acceleration and gas mileage, the air con-
ditioner compressor is designed to temporarily shut off
during air conditioner operation whenever the acceler-
ator is fully depressed such as during rapid accelera-
tion or when driving on a steep upgrade. ! Refrigerant for your climate control
system
Your air conditioner uses ozone friendly refrigerant
HFC134a. Therefore, the method of adding, changing
or checking the refrigerant is different from the method
for CFC12 (Freon). Consult your SUBARU dealer for
service. Repairs needed as a result of using the wrong
refrigerant are not covered under warranty.Air filtration system (if equipped)
If your vehicle’s air conditioning system is equipped
with an air filtration system, replace the filter element
according to the replacement schedule shown below.
This schedule should be followed to maintain the fil-
ter’s dust collection ability. Under extremely dusty con-
ditions, the filter should be replaced more frequently. It
is recommended that you have your filter checked or
replaced by your SUBARU dealer. For replacement,
use only a genuine SUBARU air filter kit.
Replacement schedule: Every 12 months or 7,500 miles (12,000 km) whichev-
er comes first

4-24
Climate control
"
Reduction of the air flow through the vents."Windshield gets easily fogged or misted.
NOTE
The filter can influence the air conditioning, heat-
ing and defroster performance if not properly
maintained.