1998 PONTIAC FIREBIRD engine overheat

How to Check Limited-Slip Differential
The proper fluid should be added if the level is below
the
STEP mark on the reservoir. See the instructions on
the reservoir cap.
Rear Axle
When to Check and Change Lubricant
Refer to the Maintenance Schedule to determine how
often to check the lubricant and when to change it. See
“Scheduled Maintenance Services” in the Index.
How to Check Lubricant
If the level is below the bottom of the filler plug hole,
you’ll need to add some lubricant. Add enough lubricant
to raise the level to the bottom of the filler plug hole.
What to Use
Standard Differential
Use SAE 75W-90 Synthetic Gear Lubricant (GM Part
No. 12378261) or equivalent meeting GM
Specification
9986 1 15.
To add lubricant when the level is low, use SAE 75W-90
Synthetic Gear Lubricant (GM Part No. 12378261) or
equivalent meeting
GM Specification 99861 15. To
completely refill after draining, add
4 ounces (1 18 ml)
of Limited-Slip Differential Lubricant Additive (GM
Part No. 1052358) or equivalent. Then fill to the bottom
of the filler plug hole with Synthetic Gear Lubricant.
Engine Coolant
The cooling s stem in your vehicle is filled with
DEX-COOL
8 engine coolant. This coolant is designed
to remain in your vehicle for
5 years or 150,000 miles
(240
000 kmb 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” in the Index.
6-27

A 50/50 mixture of water and DEX-COOL@
coolant will:
0 Give freezing protection down to -34°F (-37°C).
0 Give boiling protection up to 265 “F (1 29°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 water (preferably
distilled) and one-half
DEX-COOL@ coolant which
won’t damage aluminum parts. If you use this mixture,
you don’t need to add anything else.
I A CAUTION:
Adding only plain water to your cooling system
can
be dangerous. Plain water, or some other
liquid like
alcohol, can boil before the proper
coolant mixture will. Your vehicle’s coolant
warning system is set
for the proper coolant
mixture. With plain water or the wrong mixture,
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 water and
DEX-COOL@ coolant.
6-28

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.
I 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.
Checking Coolant
When your engine is cold, check the dipstick on the cap
of the coolant recovery tank. The coolant level should
be at
COLD, or a little higher. When your engine is
warm, the level on the dipstick should be up to HOT, or
a little higher.
6-29

1
If this light comes on, it
means you’re
low on
5.7L Engine
Adding Coolant to the Recovery Tank
If you need more coolant, add the proper DEX-COOL@
coolant mixture at the coolant recovery tank, but only
when your engine is cool. If the tank is very low or
empty,
also add coolant to the radiator. See “Engine
Overheating’’
in the Index for information.
A CAUTION:
Thrning the radiator pressure cap when the
engine and radiator are hot can allow steam
and scalding liquids to blow out and burn you
badly. Never turn the pressure cap
-- even a
little -- when the engine and radiator are hot.
L
Add coolant mixture at the recovery tank, but be careful
not to spill it.
I /1 CAUTION:
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.
I

Radiator Pressure Cap (All Engines)
I NOTICE:
Your radiator cap is an 18 psi (124 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.
When you replace your radiator pressure cap, a GM cap
is recommended.
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.
When you replace your thermostat, a GM thermostat
is
recommended.
Power Steering Fluid
The power steering fluid
reseivoir is locatei toward
the back
of the engine on
the driver’s side.
When to Check Power Steering Fluid
It is not necessary to regularly check power steering fluid
unless you suspect there is a leak in the system or you hear
an unusual noise. A fluid loss in this system could indicate
a problem. Have the system inspected
and repaired.
How To Check Power Steering Fluid
When the engine compartment is cool, wipe the cap and
the top of the reservoir clean, then unscrew the cap and
wipe the dipstick with a clean rag. Replace
the cap and
completely tighten it. Then remove the cap again and
look at the fluid level on the dipstick.
6-31

Driver Position ................................. 1-14
Driver’s Door
Alarm Delay and Shock Sensor Enable . . 2-22
Driving City
........................................ 4-20
Defensive
.................................... 4-2
Drunken
..................................... 4-3
Freeway
.................................... 4-2 1
In a Blizzard ................................. 4-28
In Foreign Countries ........................... 6-5
IntheRain
.................................. 4-17
Night
...................................... 4-15
On Curves
.................................. 4-10
On Grades While Towing a Trailer
............... 4-37
On
Hill and Mountain Roads .................... 4-23
On Snow and Ice ............................. 4-26
Throughwater
............................... 4-19
WetRoads
.................................. 4-17
Winter
...................................... 4-25
With a Trailer
................................ 4-36
DrunkenDriving
................................ 4-3
Electrical Equipment. Adding
..... 2-27.2.28.3-20. 6-62
Electrical System
............................... 6-62
Engine
.................................. 6-10. 6-11
Coolant
..................................... 6-27
Coolant Heater
............................... 2-29
Coolant Level Check .......................... 7-32
Coolant Temperature Gage
..................... 2-84
Exhaust ..................................... 2-42
FuseBlocks
................................. 6-67 Identification
................................ 6-62
OilLevelCheck .............................. 7-32
Overheating
................................. 5-15
Running
While Parked ......................... 2-43
Specifications ................................ 6-68
StartingYour ................................ 2-26
Engineoil
.................................... 6-12
Additives
................................... 6-17
Checking
................................... 6-13
Used
....................................... 6-17
What Kind
Of Oil to Use ....................... 6-14
WhentoAdd
................................ 6-14
When to Change
.............................. 6-17
Ethanol
........................................ 6-5
Exit Lighting
............................. 2-19, 2-55
Exit Lighting and Delayed Illumination
............. 2-19
Fabric Cleaning
............................... 6-54
FanControlKnob
............................... 3-2
FeatureCustomization
........................... 2-18
Driver’s
Door Alarm Delay and
Shock Sensor Enable ....................... 2-22
Exit Lighting
and Delayed Illumination ........... 2-19
Last
Door Closed Locking and Lockout Prevention . . 2-20
Remote Keyless Entry Lock Verification
........... 2-20
Theft-Deterrent Arming Method ................. 2-21
Filling A Portable Fuel Container ................... 6-8
FillingYourTank ................................ 6-6
Theft-Deterrent Arming Verification
.............. 2-22

Oil. Engine .................................... 6- 12
Oil Pressure Gage .............................. 2-88
Overdrive. Automatic Transmission ................ 2-32
Overheating Engine ............................. 5- 15
Owner Checks and Services ....................... 7-32
Owner Publications. Ordering ..................... 8- 12
paint Spotting. Chemical ........................ 6-60
PARK (P)
Automatic Transmission ....................... 2-30
Shifting Into ................................. 2-39
Shifting Out of ............................... 2-41
AtNight .................................... 2-13
Brake ...................................... 2-44
Brake Mechanism Check ....................... 7-35
Lots ....................................... 2-13
OverThingsThatBurn ........................ 2-42
With a Trailer ................................ 4-38
Parking Your Vehicle. Manual Transmission .......... 2-41
Passenger Position ......................... 1-22. 1-28
PASS-Key (8, II ................................. 2-17
Periodic Maintenance Inspections .................. 7-36
Pontiac Cares Information ......................... 8-2
Power
Antenna
Mast Care ............................ 3-22
DoorLocks ................................... 2-5
Option Fuses ................................ 6-63
Remote Control Mirror ........................ 2-57
Parking
Passing
....................................... 4-13
Retained Accessory ........................... 2-56
Six-WaySeat ................................. l-3
Steering .................................... 4-10
SteeringFluid ................................ 6-31
Windows ................................... 2-45
Pregnancy, Use of Safety Belts .................... 1-21
Problems on the Road ............................ 5-1
Publications, Service and Owner ................... 8-12
Radiator ................................ 5.21. 5.24
Radiator Pressure Cap ........................... 6-31
Radio Reception ................................ 3-20
Radios .......................... 3.7.3.8.3.11. 3.12
Rain. DrivingIn ................................ 4-17
Rear
RAP ......................................... 2-56
Axle ....................................... 6-27
Lamp Bulb Replacement ....................... 6-41
Seat Passengers .............................. 1-28
Sidemarker Bulb Replacement ................... 6-42
Towing ..................................... 5-13
Window Defogger ............................. 3-5
Rearview Mirror, Inside Daymight ................. 2-57
Reclining Front Seatbacks ......................... 1-5
Recommended Fluids and Lubricants ............... 7-38
Recovery Tank. Coolant .......................... 5-19
Refrigerants, Air Conditioning .................... 6-70

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