1999 TOYOTA SIENNA Owners Manual

name. SIENNA (45403U)
161
Air intake selector
Move the lever to select the air source.
1. Recirculate—Recirculates the air inside
the vehicle.
2. Fresh—Draws outside air into the sys-
tem.”A/C” button
To turn on the air conditioning, press the
”A/C” button. The ”A/C” button indicator
will come on. To turn the air conditioning
off, press the button again.
If the ”A/C” button indicator flashes, there
is a problem in the air conditioning system
and the air conditioning automatically
shuts off. If this happens, take your ve-
hicle to a Toyota dealer for service.
ProCarManuals.com

name. SIENNA (45403U)
162
—Air flow selector settings —Operating tips
To cool off your Toyota after it has
been parked in the hot sun, drive with
the windows open for a few minutes.
This vents the hot air, allowing the air
conditioning to cool the interior more
quickly.
Make sure the air intake grilles in front
of the windshield are not blocked (by
leaves or snow, for example).
On humid days, do not blow cold air
on the windshield. The windshield could
fog up because of the difference in air
temperature on the inside and outside
of the windshield.
Keep the area under the front seats
clear to allow air to circulate through-
out the vehicle.
On cold days, move the fan speed to
”HI” for a minute to help clear the in-
take ducts of snow or moisture. This
can reduce the amount of fogging on
the windows.
ProCarManuals.com

name. SIENNA (45403U)
163
Heating
For best results, set controls to:
Fan speed—Any setting except ”OFF”
Temperature—To w a r d s WARM
(red zone)
Air intake—FRESH (outside air)
Air flow—FLOOR
Air conditioning—OFF
For quick heating, select recirculated
air for a few minutes. To keep the
windows from fogging, select fresh af-
ter the vehicle interior has been
warmed.
Press the ”A/C” button on for dehumidi-
fied heating.
Choose floor/windshield air flow to heat
the vehicle interior while defrosting or
defogging the windshield.Air conditioning
For best results, set controls to:
Fan speed—Any setting except ”OFF”
Temperature—To w a r d s COLD
(blue zone)
Air intake—FRESH (outside air)
Air flow—PANEL
Air conditioning—ON
For quick cooling, move the air intake
selector to recirculate for a few min-
utes.
Ventilation
For best results, set controls to:
Fan speed—Any setting except ”OFF”
Temperature—To w a r d s COLD
(blue zone)
Air intake—FRESH (outside air)
Air flow—PANEL
Air conditioning—OFF
Defogging
The inside of the windshield
For best results, set controls to:
Fan speed—Any setting except ”OFF”
Temperature—To w a r d s WARM
(red zone) to heat;
COLD (blue zone) to
cool
Air intake—FRESH (outside air)
Air flow—WINDSHIELD
Turning the air flow control knob to wind-
shield position turns on the defroster−
linked air conditioning. This is to clean up
the front view more quickly.
When the ”A/C” button is not pressed in,
turning the air flow control knob to anoth-
er position turns off the air conditioning.
On humid days, do not blow cold air
on the windshield—the difference be-
tween the outside and inside tempera-
tures could make the fogging worse.
ProCarManuals.com

name. SIENNA (45403U)
164
Defrosting
The outside of the windshield
For best results, set controls to:
Fan speed—Any setting except ”OFF”
Temperature—To w a r d s WARM
(red zone)
Air intake—FRESH (outside air)
Air flow—WINDSHIELD
Turning the air flow control knob to wind-
shield position turns on the defroster−
linked air conditioning. This is to clean up
the front view more quickly.
When the ”A/C” button is not pressed in,
turning the air flow control knob to anoth-
er position turns off the air conditioning.
To heat the vehicle interior while de-
frosting the windshield, choose
floor/windshield air flow.
—Side vents
Driver’s side
Passenger’s side
If air flow control is not satisfactory, check
the side vents. The side vents may be
opened or closed as shown.
ProCarManuals.com

name. SIENNA (45403U)
165
1. Fan speed selector (front)
2. Fan speed selector (rear)
3. Air flow selector
4. Temperature selector
Rear air conditioning system—
—Controls
4−door models
ProCarManuals.com

name. SIENNA (45403U)
166
1. Fan speed selector (front)
2. Fan speed selector (rear)
3. Temperature selector
4. Air flow selector 5−door models
ProCarManuals.com

name. SIENNA (45403U)
167
1. Fan speed selector (front)
This lever is used to turn the rear air
conditioning system on and off, and adjust
the fan speed.
Move the lever to ”REAR” so that you can
operate the rear air conditioning system
by the rear controller.
Move the lever to adjust the fan
speed—to the right to increase, to the left
to decrease. Moving the lever to ”OFF”
turns off the rear air conditioning system
and the system cannot be operated by the
rear controller.
2. Fan speed selector (rear)
When the front fan speed selector is in
”REAR”, you can operate it.
Move the lever to adjust the fan
speed—to the right to increase, to the left
to decrease.
Temperature selector
4−door models—
Move the lever to adjust the tempera-
ture—to the right to warm, to the left to
cool.
5−door models—
Move the lever to adjust the tempera-
ture—to the right to warm, to the ”A/C”
position to cool.
Air flow selector (4−door models)
Air flow selector (5−door models)
Turn the knob to select the vents used for
air flow.
4−door models—
1. Panel—Air flows mainly from the door
panel vents.
2. Bi−level—Air flows from both the door
panel vents and floor vents.
3. Floor—Air flows mainly from the floor
vents.
5−door models—
1. ”A/C”—Air flows mainly from the roof
vents.
2. Except ”A/C”—Air flows mainly from
the floor vents.
ProCarManuals.com

name. SIENNA (45403U)
168
—Air flow selector settings
4−door models5−door models
—Roof vents
Open
Close
If air flow control is not satisfactory, check
the roof vents. The roof vents may be
opened or closed as shown.
ProCarManuals.com