1999 NISSAN SENTRA heating

Air recirculation button
(if so equipped)
NOTE:
The air recirculation feature is available
only on those vehicles equipped with air
conditioning.
OFF position (indicator light off):
Outside air is drawn into the passenger
compartment and distributed through the
selected outlets.
Use the OFF position for normal heater or
air conditioner operation.
ON position (indicator light on):
Interior air is recirculated inside the vehicle.
Push the
button to the on position
when:
cdriving on a dusty road.
cto avoid traffic fumes.
cfor maximum cooling when using the air
conditioner.
Air conditioner button
(if so equipped)
Start the engine, move the fan control dial to
the desired (one to four) position, and push
the air conditioner button to turn on the air
conditioner. The indicator light comes on
when the air conditioner is operating. To
turn off the air conditioner, push the button
again.
The air conditioner cooling function op-
erates only when the engine is running.
HEATER OPERATION
Heating
This mode is used to direct hot air mainly
from the floor outlets. A small amount of air
also flows from the defrost outlets.
1. Push the
button (if so equipped) to
the off position for normal heating.
2. Move the air control dial to the
po-
sition.
3. Move the fan control dial to the desired
position.
4. Move the temperature control dial to thedesired position between the middle and
the hot position.
Ventilation
This mode directs outside air from the side
and center vents.
1. Push the
button (if so equipped) to
the off position.
2. Move the air control dial to the
po-
sition.
3. Move the fan control dial to the desired
position.
4. Move the temperature control dial to the
desired position.
Defrosting or defogging
This mode is used to defrost/defog the
windows.
1. Move the air control dial to the
po-
sition.
cWhen the
position is selected the
function automatically cancels.
Outside air is drawn into the passenger
compartment to improve the defogging
performance.
4-4Heater, air conditioner and audio systems
ZX

2. Move the fan control dial to the desired
position.
3. Move the temperature control dial to the
desired position between the middle and
the hot position.
cIf it is difficult to defog the windshield
glass, turn the air conditioner on (if so
equipped). This helps dehumidify the air.
Bi-level heating
This mode directs cooler air from the side
and center vents and warmer air from the
floor outlets. When the temperature control
dial is moved to the full hot or full cool
position, the air between the vents and the
floor outlets is the same temperature.
1. Push the
button (if so equipped) to
the off position.
2. Move the air control dial to the
po-
sition.
3. Move the fan control dial to the desired
position.
4. Move the temperature control dial to the
the desired position.
Heating and defogging
This mode heats the interior and defogs the
windshield.
1. Move the air control dial to the
po-
sition.
cWhen the
position is selected the
function automatically cancels.
Outside air is drawn into the passenger
compartment to improve the defogging
performance.
2. Move the fan control dial to the desired
position.
3. Move the temperature control dial to the
desired position between the middle and
the hot position.
Operating tips
Clear snow and ice from the wiper
blades and air inlet in front of the wind-
shield. This improves heater operation.
AIR CONDITIONER OPERATION
(if so equipped)
Start the engine, move the fan control dial to
the desired (one to four) position, and push
in the air conditioner button to activate theair conditioner. When the air conditioner is
on, cooling and dehumidifying functions are
added to the heater operation.
The air conditioner cooling function op-
erates only when the engine is running.
Cooling
This mode is used to cool and dehumidify
the air.
1. Push the
button to the off position.
2. Move the air control dial to the
po-
sition.
3. Move the fan control dial to the desired
position.
4. Push on the air conditioner button. The
indicator light comes on.
5. Move the temperature control dial to the
desired position.
Heater, air conditioner and audio systems
4-5
ZX

For quick cooling when the outside tem-
perature is high, push thebutton to the
ON position. Be sure to return the air recir-
culation button to the OFF position for nor-
mal cooling.
Dehumidified heating
This mode is used to heat and dehumidify
the air.
1. Push the
button to the off position.
2. Move the air control dial to the
po-
sition.
3. Move the fan control dial to the desired
position.
4. Push on the air conditioner button. The
indicator light comes on.
5. Move the temperature control dial to the
desired position.
Dehumidified defogging
This mode is used to defog the windows
and dehumidify the air.
1. Move the air control dial to the
po-
sition.
cWhen the
position is selected thefunction automatically cancels.Outside air is drawn into the passenger
compartment to improve the defogging
performance.
2. Move the fan control dial to the desired
position.
3. Push on the air conditioner button. The
indicator light comes on.
4. Move the temperature control dial to the
desired position.
Operating tips
cKeep windows and sunroof closed while
the air conditioner is in operation.
cAfter parking in the sun, drive for two or
three minutes with the windows open to
vent hot air from the passenger compart-
ment. Then, close the windows. This
allows the air conditioner to cool the
interior more quickly.
cThe air conditioning system should be
operated for approximately ten min-
utes at least once a month. This helps
prevent damage to the system due to
lack of lubrication.
cIf the engine coolant temperature
gauge indicates engine coolant tem-perature over the normal range, turn
the air conditioner off. See ``If your
vehicle overheats'' in the ``In case of
emergency'' section of this manual.
AIR FLOW CHARTS
The following charts show the button and
dial positions forMAXIMUM AND QUICK
heating, cooling or defrosting.The air recir-
culation switch should always be in the
OFF position for heating and defrosting.
4-6Heater, air conditioner and audio systems
ZX

increases wear on the brake linings and
pads, and reduces gas mileage.
To help save the brakes and to prevent the
brakes from overheating, reduce speed and
downshift to a lower gear before going down
a slope or long grade. Overheated brakes
may reduce braking performance and could
result in loss of vehicle control.
WARNING
cWhile driving on a slippery surface,
be careful when braking, accelerat-
ing or downshifting. Abrupt braking
or accelerating could cause the
wheels to skid and result in an acci-
dent.
cIf the engine is not running or is
turned off while driving, the power
assist for the brakes will not work.
Braking will be harder.
The anti-lock brake system controls the
brakes at each wheel so the wheels do not
lock when braking abruptly or when braking
on slippery surfaces. The system detects the
rotation speed at each wheel and varies the
brake fluid pressure to prevent each wheel
from locking and sliding. By preventing wheel
lockup, the system helps the driver maintain
steering control and helps to minimize swerv-
ing and spinning on slippery surfaces.
Using the System
Depress the brake pedal and hold it down.
WARNING
Do not pump the brake pedal. Doing so
may result in increased stopping dis-
tances.
Normal operation
The anti-lock brake system does not oper-
ate at speeds below 3 to 6 MPH (5 to 10
km/h). The speeds vary according to road
conditions. When the anti-lock system
senses that one or more wheels are close to
locking up, the actuator (under the hood)
rapidly applies and releases hydraulic pres-
sure (like pumping the brakes very quickly).While the actuator is working, you may feel
a pulsation in the brake pedal and hear a
noise or vibration from the actuator under
the hood. This is normal and indicates that
the anti-lock system is working properly.
However, the pulsation may indicate that
road conditions are hazardous and extra
care is required while driving.
Self-test feature
The anti-lock brake system is sophisticated,
with electronic sensors, electric pumps, and
hydraulic solenoids controlled by a com-
puter. The computer has a built-in diagnos-
tic feature that tests the system each time
you start the engine and move the vehicle at
a low speed in forward or reverse. When the
self-test occurs, you may hear a ``clunk''
noise and/or feel a pulsation in the brake
pedal. This is normal and is not an indica-
tion of any malfunction. If the computer
senses any malfunction, it switches the anti-
lock brake system OFF and turns on the
ABS brake warning light in the dashboard.
The brake system then operates normally,
but without anti-lock assistance.
If the light comes on during the self-test or
while driving, take the vehicle to an autho-
rized NISSAN dealer for repair.
ANTI-LOCK BRAKE SYSTEM
(ABS) (if so equipped)
5-18Starting and driving
ZX

CAUTION
cAutomatic transmission models can-
not be push started. This may cause
transmission damage.
cThree-way catalytic converter
equipped models should not be
started by pushing since the three
way catalyst may be damaged.
cNever try to start the vehicle by tow-
ing it; when the engine starts, the
forward surge could cause the ve-
hicle to collide with the tow vehicle.If your vehicle is overheating (indicated by
an extremely high temperature gauge read-
ing), or if you feel a lack of engine power,
detect abnormal noise, etc., take the follow-
ing steps.
WARNING
cDo not continue to drive if your ve-
hicle overheats. Doing so could
cause a vehicle fire.
cTo avoid the danger of being
scalded, never remove the radiator
cap while the engine is still hot.
When the radiator cap is removed,
pressurized hot water will spurt out,
possibly causing serious injury.
cDo not open the hood if steam is
coming out.
1. Move the vehicle safely off the road,
apply the parking brake and move the
shift lever to N (Neutral) (manual trans-
mission) or the shift selector lever to P
(Park) (automatic transmission).
Do not stop the engine.
2. Turn off the air conditioner. Open all the
windows, move the heater or air condi-
tioner temperature control to maximumhot and fan control to high speed.
3. If engine overheating is caused by climb-
ing a long hill on a hot day, run the engine
at a fast idle (approximately 1,500 rpm)
until the temperature gauge indication
returns to normal.
4. Get out of the vehicle. Look and listen for
steam or coolant escaping from the ra-
diator before opening the hood. Wait until
no steam or coolant can be seen before
proceeding.
5. Open the hood.
WARNING
If steam or water is coming from the
engine, stand clear to prevent getting
burned.
6. Visually check drive belts for damage or
looseness. Also check if the cooling fan
is running. The radiator hoses and radia-
tor should not leak water. If coolant is
leaking, the water pump belt is missing or
loose, or the cooling fan does not run,
stop the engine.
PUSH STARTING IF YOUR VEHICLE
OVERHEATS
6-10In case of emergency
ZX

If the cooling system frequently requires
coolant, have it checked by an autho-
rized NISSAN dealer.
CHANGING ENGINE COOLANT
cMajor cooling system repairs should be
performed by an authorized NISSAN
dealer. The service procedures can befound in an appropriate NISSAN Service
Manual.
cImproper servicing can result in reduced
heater performance and engine over-
heating.
WARNING
cTo avoid the danger of being
scalded, never change the coolant
when the engine is hot.
cNever remove the radiator cap when
the engine is hot. Serious burns
could be caused by high pressure
fluid escaping from the radiator.
DI1211M
8-6Do-it-yourself
ZX

1. Move the heater or air conditioner tem-
perature control dial to the maximum hot
position.
2. Open the radiator drain plug. Open the
drain plug on the engine block.3. Open the radiator cap to drain the cool-
ant.
4. Flush the cooling system by running
fresh water through the radiator.
5. Close the drain plugs on the radiator and
the engine block securely.
6. See the ``Technical and consumer infor-
mation'' section for cooling system ca-
pacity. Fill the radiator slowly with the
proper mixture of coolant and water. Fill
the reservoir tank up to the MAX level.
7. Open and close the air release plug(s) to
release air. Then fill the radiator again
and install the radiator cap.
8.
Start the engine, and warm it up until it
reaches normal operating temperature.
Then race the engine two or three times
under no load. Watch the engine coolant
temperature gauge for signs of overheating.
ADI0632
ADI0615
Do-it-yourself8-7
ZX

of at least 87 AKI (Anti-Knock Index). How-
ever, you may use unleaded gasoline with
an octane rating as low as 85 AKI (Anti-
Knock Index) in high altitude areas (over
4,000 ft [1,219 m]) such as: Colorado, Mon-
tana, New Mexico, Utah, Wyoming, north-
eastern Nevada, southern Idaho, western
South Dakota, western Nebraska, and the
part of Texas which is directly south of New
Mexico.
Using unleaded gasoline with an octane
rating lower than stated above can cause
persistent, heavy ``spark knock.'' (``Spark
knock'' is a metallic rapping noise.) If
severe, this can lead to engine damage. If
you detect a persistent heavy spark
knock even when using gasoline of the
stated octane rating, or if you hear steady
spark knock while holding a steady
speed on level roads, have an authorized
NISSAN dealer correct the condition.
Failure to correct the condition is misuse
of the vehicle, for which NISSAN is not
responsible.
Incorrect ignition timing may result in spark
knock, after-run and/or overheating, which
may cause excessive fuel consumption or
engine damage. If any of the above symp-toms are encountered, have your vehicle
checked at an authorized NISSAN dealer or
other competent service facility.
However, now and then you may notice
light spark knock for a short time while
accelerating or driving up hills. This is
not a cause for concern, because you
get the greatest fuel benefit when there
is light spark knock for a short time
under heavy engine load.
10-4Technical and consumer information
ZX