2003 PONTIAC GRAND PRIX radiator

Engine Coolant Temperature
Warning Light
TEMP
This light tells goti ihai
the engine coolant has
overheated or the
radiator cooling fan is
not working.
If you have been operating the vehicle under normal
driving conditions, you should pull
of the road, stop the
vehicle and turn
off the engine as soon as possible.
See Engine Overheating on page
5-33.
Engine Coolant Temperature Gage
United States
19
Canada
Your vehicle has a gage that shows the engine coolant
temperature.
If the gage pointer moves into the
shaded area, the engine is too hot.
That reading means the same thing as the warning
light. It means that the engine coolant has overheated.
If you have been operating the vehicle under normal
conditions, you should pull
off the road, stop the vehicle,
and turn
off the engine as soon as possible.
See Engine Overheating
on page 5-33.
3-31

Section 5 Service and Appearance Care
Service ............................................................ 5.3
Doing Your
Owr? Service Work ......................... 5-4
Adding Equipment to the Outside of
Your Vehicle
.............................................. 5-4
Fuel ................................................................ 5-5
Gasoline Octane
............................................ 5-5
Gasoline Specifications
.................................... 5-5
California Fuel
............................................... 5-6
Additives
....................................................... 5-6
Fuels in Foreign Countries
............................... 5-7
Filling Your Tank
............................................ 5-7
Filling a Portable Fuel Container
....................... 5-9
Checking Things Under the Hood .................... 5-10
Hood Release
.............................................. 5-10
Engine Compartment Overview
....................... 5-12
Engine Oil
................................................... 5-18
Supercharger Oil
.......................................... 5-24
Engine Air CleanedFilter
................................ 5-25
Automatic Transaxle Fluid
.............................. 5-27
Engine Coolant
............................................. 5-30
Radiator Pressure Cap
.................................. 5-33
Cooling System
........................................... -5-36
Power Steering Fluid
..................................... 5-46
Windshield Washer Fluid
................................ 5-48
Engine Overheating
....................................... 5-33 Brakes
........................................................ 5.49
Battery
........................................................ 5.52
Jump Starting
............................................... 5-53
Bulb Replacement .......................................... 5-60
Halogen Bulbs
.............................................. 5-60
Headlamps
.................................................. 5-60
Front Turn Signal and Sidemarker Lamps
........ 5-62
Center High-Mounted Stoplamp (CHMSL)
......... 5-63
Taillamps, Sidemarker and Back-up Lamps
...... 5-64
Replacement Bulbs
....................................... 5-66
Windshield Wiper Blade Replacement .............. 5-67
Tires ............................................................. -5-68
Inflation
-- Tire Pressure ................................ 5-68
Tire Inspection and Rotation
........................... 5-69
When It
Is Time for New Tires ....................... 5-70
Buying New Tires
......................................... 5-71
Uniform Tire Quality Grading
.......................... 5-72
Wheel Replacement
...................................... 5-73
Headlamp Aiming ........................................... 5-59
Wheel Alignment and Tire Balance
.................. 5-73
Tire Chains
.................................................. 5-75
If a Tire Goes Flat ........................................ 5-76
Changing a Flat Tire
..................................... 5-76
Compact Spare Tire
...................................... 5-87
5- 1

A. Windshield Washer Fluid Reservoir
B. Battery
C. Underhood Fuse Block
B. Remote Positive (+) Battery Terminal
E. Radiator Pressure Cap
F. Engine Coolant Recovery Tank
G. Power Steering Fluid Reservoir
(low in engine compartment, below generator)
H. Electric Engine Cooling Fan
I. Engine Oil Fill Cap
J. Engine Oil Dipstick
K. Automatic Transaxle Fluid Dipstick
L. Brake Fluid Reservoir
M. Engine Air CleanedFilter
5-1 3

A. Windshield Washer Fluid
B. Battery
C. Remote Positive
(+) Battery Terminal
D. Underhood Fuse Block
E. Radiator Fill Cap
F. Engine Coolant Recovery Tank
G. Power Steering Fluid Reservoir
(low in engine compartment, below generator)
H. Electric Engine Cooling Fan
I. Engine Oil Dipstick
J. Engine Oil Fill Cap
K. Automatic Transaxle Fluid Dipstick
1. Brake Fluid Reservoir
M. Engine Air CleanedFilter
5-1 5

A. Windshield Washer Fluid Reservoir
B. Battery
C. Underhood Fuse Block D. Remote Positive
(+) Battery Terminal
E. Radiator Pressure Cap
F. Engine Coolant Recovery Tank
G. Power Steering Fluid Reservoir
H. Electric Cooling Fan
(low
in engine compartment, below generator)
I. Engine Oil Dipstick
J. Engine Oil Fill Cap
K. Transaxle Fluid Dipstick
L. Brake Master Cylinder Reservoir
M. Engine Air CleanedFilter
Before closing the hood
of your vehicle, be sure all the
filler caps are on properly. Then pull the
hood down
and close it firmly.
5-1 7

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 or
if you need to add coolant to
your radiator, see Engine Overheating on page
5-33.
A 50/50 mixture of clean, drinkable water and
DEX-COOL@ engine coolant will:
Give freezing protection down to -34°F (-37°C).
Give boiling protection up to 265°F (129°C)
Protect against rust and corrosion.
Help keep the proper engine temperature.
Let the warning lights and gages work as
they should.
Notice: When adding coolant, it is important that
you use only
DEX-COOL@ (silicate-free) coolant.
If coolant other than DEX-COOL@ is added to the
system, premature engine, heater core or radiator
corrosion may result. In addition, the engine coolant
will require change sooner
-- at 30,000 miles
(50,000 km) or 24 months, whichever occurs first.
Damage caused by the use
of coolant other than
DEX-COOL@ is not covered by your new vehicle
warranty.
What to Use
Use a mixture of one-half clean, drinkable water and
one-half DEX-COOL@ engine coolant which won’t
damage aluminum parts. If you use this coolant mixture,
you don’t need to add anything else.
1 ---.-.g only p n water to your c 3 system
can be dangerous. Plain water, or some other
liquid such as alcohol, can boil before the
proper coolant mixture will. Your vehicle’s
coolant warning system is set
for the proper
CAUTION: (Continued)
I
5-30

Checking Coolant
coo It n ture. water or e
wrongmixture, your engine could get too hot
but you wouldn’t get the overheat warning.
Your engine could catch fire and you or others
could be burned. Use a
50/50 mixture of clean,
drinkable water and
DEX-COOL@ coolant.
Notice: If you use an improper coolant mixture,
your engine could overheat and be badly damaged.
The repair cost wouldn’t be covered by your
warranty.
Too much water in the mixture can freeze
and crack the engine, radiator, heater core and
other parts.
If you have to add coolant more than four times a year,
have your dealer check your cooling system.
Notice: If you use the proper coolant, you don’t
have to add extra inhibitors or additives which claim
to improve the system. These can be harmful. The
coolant recovery tank is located in the engine
compartment toward the rear of the engine
on
the passenger’s side of the vehicle.
See Engine Compartment Overview on page
5-12 for
more information on location. The vehicle must be on
a level surface.
When your engine is
cold, the coolant level
should be
at the COLD
mark or a little higher.
When your engine is
warm, the level should
be up to the HOT mark
or a little higher.
When your engine is warm, the level should be up to
the HOT mark or a little higher.
5-31

Adding Coolant
If you need more coolant, add the proper DEX-COOL@
coolant mixture at the coolant recovery tank, but be
careful not to spill it.
If the coolant recovery tank is completely empty, add
coolant to the radiator. See Engine Overheating
on page 5-33.
Turning -.le radiator pressure cap when the engine and radiator are hot can allow steam and scalding liquids to blow out and burn
you badly.
With the coolant recovery tank,
you will almost never have to add coolant at
the radiator. Never turn the radiator pressure
cap
-- even a little -- when the engine and
radiator are hot. You can be burned if you
spill coolant on hot
engine parts. Coolant contains ethylene glycol,
and
it will burn if the engine parts are hot
enough. Don’t spill coolant on a hot engine.
Occasionally check the coolant level in the radiator.
For information on how to add coolant to the radiator,
see Cooling System
on page 5-36.
5-32