coolant temperature GMC JIMMY 1999 Owner's Manual

yellowblue
2-21 To Use the Engine Coolant Heater
1. Turn off the engine.
2. Open the hood and unwrap the electrical cord. The
cord is located on the driver's side of the engine
compartment, behind the underhood fuse block.
3. Plug it into a normal, grounded 110
-volt AC outlet.
CAUTION:
Plugging the cord into an ungrounded outlet
could cause an electrical shock. Also, the wrong
kind of extension cord could overheat and cause
a fire. You could be seriously injured. Plug the
cord into a properly grounded three
-prong
11 0
-volt AC outlet. If the cord won't reach, use a
heavy
-duty three-prong extension cord rated for
at least 15 amps.
4. Before starting the engine, be sure to unplug
and store the cord as it was before to keep it away
from moving engine parts. If you don't, it could
be damaged.How long should you keep the coolant heater plugged
in? The answer depends on the outside temperature, the
kind of oil you have, and some other things. Instead of
trying to list everything here, we ask that you contact
your dealer in the area where you'll be parking your
vehicle. The dealer can give you the best advice for that
particular area.
Automatic Transmission Operation
Your automatic transmission may have a shift lever
located on the console between the seats or on the
steering column.
There are several different positions for your shift lever.
If your vehicle is equipped with a column shift lever, it
features an electronic shift position indicator within the
instrument cluster. This display must be powered anytime the
shift lever is capable of being moved out of PARK (P). This
means that if your key is in OFF, but not locked, there will be
a small current drain on your battery which could discharge
your battery over a period of time. If you need to leave your
key in the ignition in OFF for an extended period, it is
recommended that you disconnect the battery cable from
the battery to prevent discharging your battery.
PARK (P): This locks your rear wheels. It's the best
position to use when you start your engine because your
vehicle can't move easily.

yellowblue
2-80 Anti-Lock Brake System Warning Light
With the anti-lock brake
system, this light will
come on when you start
your engine and may stay
on for several seconds.
That's normal.
If the light stays on, or comes on when you're driving,
your vehicle needs service. If the regular brake system
warning light isn't on, you still have brakes, but you
don't have anti
-lock brakes. If the regular brake system
warning light is also on, you don't have anti
-lock brakes
and there's a problem with your regular brakes. See
ªBrake System Warning Lightº earlier in this section.
The anti
-lock brake system warning light should come
on briefly when you turn the ignition key to RUN. If the
light doesn't come on then, have it fixed so it will be
ready to warn you if there is a problem.
Engine Coolant Temperature Gage
This gage shows the
engine coolant temperature.
If the gage pointer moves
into the red area, your
engine is too hot!
It means that your engine coolant has overheated. If you
have been operating your vehicle under normal driving
conditions, you should pull off the road, stop your
vehicle and turn off the engine as soon as possible.
The ªProblems on the Roadº section of this manual
show you what to do. See ªEngine Overheatingº in
the Index.

yellowblue
2-85 Tow/Haul Mode Light (If Equipped)
This light should come on
when the tow/haul mode has
been selected.
For more information, see ªTow/Haul Modeº in
the Index.
Check Gages Light
The CHECK GAGES light
will come on briefly when
you are starting the engine.
If the light comes on and stays on while you are driving,
check your coolant temperature and engine oil pressure
gages to see if they are in the warning zones.
Gate Ajar Light
If this light comes on, your
liftgate is ajar. Try closing
the liftgate again. Never
drive with the liftgate even
partially open.
Fuel Gage
When the ignition is on,
the fuel gage tells you
about how much fuel you
have remaining.

yellowblue
3-5
With the automatic setting, the air conditioning
compressor automatically cycles when needed to cool
the air. In cold weather, when the system senses the need
for heat, the airflow will be directed out the floor
outlets. As the interior temperature approaches a desired
setting, the blower speed will decrease. To maintain
interior comfort, the airflow will adjust between the
instrument panel air outlets and floor outlets. On bright
sunny days in cool weather, the airflow may come out of
the air conditioning and floor outlets (bi
-level mode) to
maintain comfort and prevent stuffiness.
To avoid blowing cold air in cold weather, the system
will delay turning on the fan until warm air is available.
The length of delay depends on the outside air
temperature, engine coolant temperature or the time
since the engine was last started. As the coolant warms
up, the blower fan speed will gradually increase and air
will flow from the heater outlets, with some airflow to
the windshield to prevent fogging under most
normal conditions.
If your vehicle is sitting out on a warm day and you
have the fan set on AUTO, the air will first flow out of
the floor air outlets for a few seconds. That is normal.
This is to expel hot air from the air outlets. As the air is
cooled, the airflow will move through the air
conditioning outlets.Be careful not to put anything over the solar sensor
located around the center of the instrument panel.
This sensor is used by the automatic system to
regulate temperature.
Mode Knob
- Manual Operation
The right knob on the control panel allows you to
choose the direction of air delivery.
You can choose to set the climate control system
operations yourself, or let the system work for you by
placing the system in AUTO mode. See ªMode
Knob
- Automatic Operationº earlier in this section.
PANEL: This setting directs most of the air
through the instrument panel outlets and a small amount
through the floor outlets.
BI-LEVEL: Air is delivered through the heater
floor outlets as well as the instrument panel outlets.
HEATER: This setting directs most of the
warmed air through the heater floor outlets and some air
through the windshield defroster outlets.

yellowblue
3-7 Air Conditioning
On hot days, open the windows long enough to let hot
inside air escape. This reduces the time it takes for your
vehicle to cool down. Then keep your windows closed
for the air conditioner to work its best.
For quick cool
-down on very hot days, use MAX A/C
with the temperature knob turned to the left. This setting
should be used to keep odors and/or dust from entering
the vehicle. For normal cooling on hot days, use A/C
with the temperature knob turned to the left.
On vehicles equipped with the Electronic Climate
Control system, this same performance can be achieved
as long as the A/C is enabled and the outside air button
is not active.
On cool but sunny days, use BI
-LEVEL A/C to deliver
warm air to the floor and cooler air to the instrument
panel outlets.
When the air conditioner is on, you may sometimes
notice slight changes in your vehicle's engine speed and
power. This is normal because the system is designed
to cycle the compressor on and off to keep the
desired temperature.
Heating
The heater works best if you keep your windows closed
while using it. On cold days, use HEATER with the
temperature knob turned clockwise. BLEND is useful in
cool weather when you have fog or ice on the
windshield or side windows.
If you use the optional engine coolant heater before
starting your engine, your heating system will produce
warmer air faster to heat the passenger compartment in
cold weather. See ªEngine Coolant Heaterº in the Index.
Defogging and Defrosting
On cool, humid days, use BLEND to keep the
windshield and side windows clear.
Use DEFROST to remove fog or ice from the
windshield quickly in extreme humid or cold conditions.
Turn the temperature knob to the right and move the fan
control toward high.

yellowblue
4-53
When you're turning with a trailer, make wider turns than
normal. Do this so your trailer won't strike soft shoulders,
curbs, road signs, trees or other objects. Avoid jerky or
sudden maneuvers. Signal well in advance.
Turn Signals When Towing a Trailer
When you tow a trailer, your vehicle has to have extra
wiring and a heavy
-duty turn signal flasher (included in
the optional trailering package).
The arrows on your instrument panel will flash
whenever you signal a turn or lane change. Properly
hooked up, the trailer lamps will also flash, telling other
drivers you're about to turn, change lanes or stop.
When towing a trailer, the arrows on your instrument
panel will flash for turns even if the bulbs on the trailer
are burned out. Thus, you may think drivers behind you
are seeing your signal when they are not. It's important
to check occasionally to be sure the trailer bulbs are
still working.
Driving On Grades
Reduce speed and shift to a lower gear before you start
down a long or steep downgrade. If you don't shift
down, you might have to use your brakes so much that
they would get hot and no longer work well.
On a long uphill grade, shift down and reduce your
speed to around 45 mph (70 km/h) to reduce the
possibility of engine and transmission overheating. If
you have an automatic transmission, you should use
THIRD (3) when towing a trailer. Operating your
vehicle in THIRD (3) when towing a trailer will
minimize heat buildup and extend the life of your
transmission. Or, if you have a manual transmission,
it's better not to use FIFTH (5) gear, just drive in
FOURTH (4) gear (or, as you need to, a lower gear).
When towing at high altitude on steep uphill grades,
consider the following: Engine coolant will boil at a lower
temperature than at normal altitudes. If you turn your
engine off immediately after towing at high altitude on
steep uphill grades, your vehicle may show signs similar to
engine overheating. To avoid this, let the engine run while
parked (preferably on level ground) with the automatic
transmission in PARK (P) (or the manual transmission out
of gear and the parking brake applied) for a few minutes
before turning the engine off. If you do get the overheat
warning, see ªEngine Overheatingº in the Index.

yellowblue
5-9
Engine Overheating
You will find a coolant temperature gage on your
vehicle's instrument panel. See ªGagesº in the Index.
If Steam Is Coming From Your Engine
CAUTION:
Steam from an overheated engine can burn you
badly, even if you just open the hood. Stay away
from the engine if you see or hear steam coming
from it. Just turn it off and get everyone away
from the vehicle until it cools down. Wait until
there is no sign of steam or coolant before you
open the hood.
If you keep driving when your engine is
overheated, the liquids in it can catch fire. You or
others could be badly burned. Stop your engine if
it overheats, and get out of the vehicle until the
engine is cool.
NOTICE:
If your engine catches fire because you keep
driving with no coolant, your vehicle can be
badly damaged. The costly repairs would not be
covered by your warranty.

yellowblue
6-24
Radiator Pressure Cap
NOTICE:
Your radiator cap is a 15 psi (105 kPa)
pressure
-type cap and must be tightly installed to
prevent coolant loss and possible engine damage
from overheating. Be sure the arrows on the cap
line up with the overflow tube on the radiator
filler neck.
Thermostat
Engine coolant temperature is controlled by a thermostat
in the engine coolant system. The thermostat stops the
flow of coolant through the radiator until the coolant
reaches a preset temperature.
Engine Coolant
The cooling system in your vehicle is filled with
DEX
-COOL engine coolant. This coolant is designed
to remain in your vehicle for 5 years or 150,000 miles
(240 000 km), whichever occurs first, if you add only
DEX
-COOL extended life coolant.
The following explains your cooling system and how
to add coolant when it is low. If you have a problem
with engine overheating, see ªEngine Overheatingº in
the Index.
A 50/50 mixture of clean, drinkable water and
DEX
-COOL coolant will:

Give freezing protection down to
-34F (-37C).

Give boiling protection up to 265F (129C).

Protect against rust and corrosion.

Help keep the proper engine temperature.

Let the warning lights and gages work as they should.

yellowblue
9-4
Easy Entry Seat 1-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Equipment, Adding 3-41, 6-59 . . . . . . . . . . . . . . . .
Electrical System 6-59 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Endgate/Liftgate 2-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Emergency Release 2-12 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manual Release 2-10, 2-11 . . . . . . . . . . . . . . . . . . . . . . . . .
Remote Rearglass Release 2-11 . . . . . . . . . . . . . . . . . . . . . .
Endgate-Mounted Spare 2-12 . . . . . . . . . . . . . . . . . . . . . . . . .
Engine 6-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Coolant Heater 2-20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Coolant Level Check 7-40 . . . . . . . . . . . . . . . . . . . . . . . . . .
Coolant Temperature Gage 2-80 . . . . . . . . . . . . . . . . . . . . .
Exhaust 2-38 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fan Noise 5-19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Identification 6-58 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Oil Level Check 7-40 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overheating 5-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Running While Parked 2-38 . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications 6-65 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Starting 2-19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine Compartment Fuse Block 6-62 . . . . . . . . . . . . . . . . . .
Engine Coolant 6-24 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine Oil 6-10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adding 6-11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Additives 6-13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking 6-11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Kind to Use 6-12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pressure Gage 2-83 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Used 6-14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
When to Change 6-13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Exhaust, Engine 2
-38 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exit Lighting 2-51 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Express-Down Window 2-40 . . . . . . . . . . . . . . . . . . . . . . . . . .
Fabric Cleaning 6-50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fifth Gear, Manual Transmission 2-25 . . . . . . . . . . . . . . . . . . .
Filling a Portable Fuel Container 6-7 . . . . . . . . . . . . . . . . . . . .
Filling Your Tank 6-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Filter
Air 6
-15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Remote Oil 6-14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Finish Care 6-54 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Finish Damage 6-56 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
First Gear, Automatic Transmission 2-24 . . . . . . . . . . . . . . . .
First Gear, Manual Transmission 2-25 . . . . . . . . . . . . . . . . . . .
Flashers, Hazard Warning 5-2 . . . . . . . . . . . . . . . . . . . . . . . . .
Flash-to-Pass 2-43 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Flat Tire, Changing 5-19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fluids and Lubricants 7-47 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fog Lamp Switch 2-50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Foreign Countries, Fuel 6-5 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fourth Gear, Manual Transmission 2-25 . . . . . . . . . . . . . . . . .
Four-Wheel Drive 2-26, 6-22 . . . . . . . . . . . . . . . . . . . . . . . . .
Four-Wheel Drive (Automatic Transfer Case) 2-29 . . . . . . . .
French Language Manual ii. . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Axle 6
-23 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Map Lamps 2-51 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Reading Lamps 2-51, 2-56 . . . . . . . . . . . . . . . . . . . . . . .
Front Storage Area 2-61 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Turn Signal Lamp Bulb Replacement 6-36 . . . . . . . . . .

yellowblue
9-5
Fuel 6-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Filling a Portable Container 6-7 . . . . . . . . . . . . . . . . . . . . . .
Filling Your Tank 6-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Foreign Countries 6-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gage 2-85 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuse Block
Engine Compartment 6
-62 . . . . . . . . . . . . . . . . . . . . . . . . . .
Instrument Panel 6-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuses and Circuit Breakers 6-59 . . . . . . . . . . . . . . . . . . . . . . .
Gages
Engine Coolant Temperature 2-80 . . . . . . . . . . . . . . . . . . . .
Engine Oil Pressure 2-83 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel 2-85 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltmeter 2-78 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Garage Door Opener 2-56, 2-68 . . . . . . . . . . . . . . . . . . . . . . .
Gas Cap 6-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gate Ajar Light 2-85 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GAWR 4-43 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Gear Positions 2-21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Glove Box 2-55 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GM Mobility Program for Persons with Disabilities 8-5 . . . . .
Gross Axle Weight Rating 4-43 . . . . . . . . . . . . . . . . . . . . . . . .
Gross Vehicle Weight Rating 4-42 . . . . . . . . . . . . . . . . . . . . . .
Guide en Fran†ais ii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
GVWR 4
-42 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Halogen Bulbs 6-34 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hazard Warning Flashers 5-2 . . . . . . . . . . . . . . . . . . . . . . . . . .
Head Restraints 1-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Headlamps 2-48 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bulb Replacement 6-34 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
High/Low Beam Changer 2-43 . . . . . . . . . . . . . . . . . . . . . .
On Reminder 2-49 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wiring 6-59 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hearing Impaired, Customer Assistance 8-4 . . . . . . . . . . . . . .
Heated Front Seats 1-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heating 3-7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Highway Hypnosis 4-34 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hill and Mountain Roads 4-35 . . . . . . . . . . . . . . . . . . . . . . . . .
Hitches, Trailer 4-50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hood 6-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Horn 2-41 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hydraulic Clutch 6-20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hydraulic Clutch Check 7-41 . . . . . . . . . . . . . . . . . . . . . . . . . .
Hydroplaning 4-30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ignition
Positions 2-16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmission Lock Check 7-43 . . . . . . . . . . . . . . . . . . . . . .
Ignition Transmission Lock Check 7-43 . . . . . . . . . . . . . . . . .
Illuminated Entry 2-51 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inflation, Tire 6-42, 7-39 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inside Day/Night Rearview Mirror 2-52 . . . . . . . . . . . . . . . . .