1999 PONTIAC GRAND PRIX heater

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5-13
CAUTION:
An electric engine cooling fan under the hood can
start up even when the engine is not running and
can injure you. Keep hands, clothing and tools
away from any underhood electric fan.
If the coolant inside the coolant recovery tank is boiling,
don't do anything else until it cools down.
The coolant level should be at or above the COLD mark
on the coolant recovery tank. If it isn't, you may have a
leak in the radiator hoses, heater hoses, radiator, water
pump or somewhere else in the cooling system.
CAUTION:
Heater and radiator hoses, and other engine
parts, can be very hot. Don't touch them. If you
do, you can be burned.
Don't run the engine if there is a leak. If you run
the engine, it could lose all coolant. That could
cause an engine fire, and you could be burned.
Get any leak fixed before you drive the vehicle.

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5-14
NOTICE:
Engine damage from running your engine
without coolant isn't covered by your warranty.
See ªOverheated Engine Protection Operating
Modeº in the Index.
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.
If there seems to be no leak, with the engine on, check to
see if the electric engine cooling fans are running. If the
engine is overheating, both fans should be running. If
they aren't, your vehicle needs service.
How to Add Coolant to the Coolant
Recovery Tank
If you haven't found a problem yet, but the coolant level
isn't at the COLD mark, add a 50/50 mixture of clean,
drinkable water and DEX
-COOL
engine coolant at the
coolant recovery tank. (See ªEngine Coolantº in the
Index for more information.)
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, drinkable water and
DEX
-COOL
coolant.

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5-15
NOTICE:
In cold weather, water can freeze and crack the
engine, radiator, heater core and other parts. Use
the recommended coolant and the proper
coolant mixture.
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.
When the coolant in the coolant recovery tank is at the
COLD mark, start your vehicle.
If the overheat warning continues, there's one more
thing you can try. You can add the proper coolant
mixture directly to the radiator, but be sure the cooling
system is cool before you do it.

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6-26
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 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.
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.

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6-27 What to Use
Use a mixture of one-half clean, drinkable water and
one
-half DEX-COOL
coolant which won't damage
aluminum parts. If you use this coolant mixture, you
don't need to add anything else.
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, 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.

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9-3
Outside of Your Vehicle 6-55 . . . . . . . . . . . . . . . . . . . . . . . .
Special Problems 6-52 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stains 6-51 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tires 6-56 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Vinyl 6-53 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wheels 6-56 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Windshield and Wiper Blades 6-54 . . . . . . . . . . . . . . . . . . .
Clock, Setting the 3-10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Column Shift 2-37 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Comfort Controls 3-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Compact Disc Care 3-28 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Compact Disc Player 3-14, 3-16 . . . . . . . . . . . . . . . . . . . . . . .
Care 3-28 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Errors 3-15, 3-17 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Trunk-Mounted CD Changer 3-19 . . . . . . . . . . . . . . . . . . . .
Compact Spare Tire 5-32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Console Shift 2-38 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Console Storage, Center 2-61 . . . . . . . . . . . . . . . . . . . . . . . . . .
Content Theft-Deterrent System 2-24 . . . . . . . . . . . . . . . . . . .
Arming Confirmation 2-25 . . . . . . . . . . . . . . . . . . . . . . . . . .
Arming with the Power Lock Switch 2-24 . . . . . . . . . . . . . .
Arming with the Remote Keyless Entry Transmitter 2-25 . .
Disarming with the Key 2-25 . . . . . . . . . . . . . . . . . . . . . . . .
Disarming with the Remote Keyless
Entry Transmitter 2
-25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Nuisance Alarms 2-25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Control
Loss Of 4
-16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Vehicle 4-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Convenience Net 2-62 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Convex Outside Mirror 2-58 . . . . . . . . . . . . . . . . . . . . . . . . . .
Coolant 6-26 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adding 6-28 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Checking 6
-28 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heater, Engine 2-30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Recovery Tank 5-14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Temperature Gage 2-80 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
What to Use 6-27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cooling System 5-12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Courtesy Lamps 2-54 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Courtesy Transportation 8-10 . . . . . . . . . . . . . . . . . . . . . . . . . .
Cruise Control 2-49 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Customer Assistance 8-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hearing Impaired 8-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Information 8-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Speech Impaired 8-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Text Telephone Users 8-5 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Customer Satisfaction Procedure 8-3 . . . . . . . . . . . . . . . . . . . .
Damage 6-57 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Finish 6-57 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sheet Metal 6-57 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Daytime Running Lamps 2-52 . . . . . . . . . . . . . . . . . . . . . . . . .
Dead Battery 5-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Defects, Reporting Safety 8-12 . . . . . . . . . . . . . . . . . . . . . . . .
Defensive Driving 4-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Defogger, Rear Window 3-8 . . . . . . . . . . . . . . . . . . . . . . . . . .
Defogging 3-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Defrosting 3-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Delayed Illumination 2-55 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DIC 2-86 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dimensions, Vehicle 6-68 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Disabilities, GM Mobility Program for Persons 8-7 . . . . . . . .
Disarming with the Key 2-25 . . . . . . . . . . . . . . . . . . . . . . . . . .
Disarming with the Remote Keyless Entry Transmitter 2-25 .
Dolby B Noise Reduction 3-13 . . . . . . . . . . . . . . . . . . . . . . . .

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9-4
Door
Ajar Light 2-87, 2-91 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Locks 2-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Drive, Automatic Transaxle 2-34 . . . . . . . . . . . . . . . . . . . . . . .
Driver Information Center 2-86 . . . . . . . . . . . . . . . . . . . . . . . .
English/Metric Button 2-90 . . . . . . . . . . . . . . . . . . . . . . . . .
Mode Button 2-90 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reset Button 2-90 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Driver Position 1-13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Driving
City 4
-21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Defensive 4-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Drunken 4-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Freeway 4-22 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
In Foreign Countries 6-5 . . . . . . . . . . . . . . . . . . . . . . . . . . .
In the Rain 4-18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Night 4-17 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
On Curves 4-12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
On Grades While Towing a Trailer 4-39 . . . . . . . . . . . . . . .
On Hill and Mountain Roads 4-25 . . . . . . . . . . . . . . . . . . . .
On Snow and Ice 4-28 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Through Water 4-21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wet Roads 4-18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Winter 4-27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
With a Trailer 4-37 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DRL 2-52 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Drunken Driving 4-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Equipment, Adding 3-26, 6-60 . . . . . . . . . . . . . . .
Electrical System 6-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrochromic Day/Night Rearview Mirror 2-57 . . . . . . . . . .
Engine 6-10, 6-11, 6-12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Air Cleaner/Filter 6-20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Coolant 6-26 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Coolant Heater 2
-30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Coolant Level Check 7-14 . . . . . . . . . . . . . . . . . . . . . . . . . .
Coolant Temperature Gage 2-80 . . . . . . . . . . . . . . . . . . . . .
Coolant Temperature Light 2-79 . . . . . . . . . . . . . . . . . . . . .
Exhaust 2-22, 2-43, 4-30 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuse Block (Passenger's Side) 6-63 . . . . . . . . . . . . . . . . . . .
Identification 6-59 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Oil Level Check 7-14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overheated Protection Operating Mode 5-9 . . . . . . . . . . . .
Overheating 5-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Running While Parked 2-44 . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications 6-67 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Starting Your 2-28 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supercharged 6-13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engine Cooling When Trailer Towing 4-40 . . . . . . . . . . . . . . .
Engine Oil 6-13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adding 6-15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Additives 6-19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking 6-14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Used 6-19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
What Kind to Use 6-16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
When to Change 6-19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ethanol 6-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exhaust, Engine 2-22, 2-43, 4-30 . . . . . . . . . . . . . . . . . . . . . .
Exit Lighting 2-55 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Express-Open Sunroof 2-65 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exterior Lamps 2-51 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fabric Cleaning 6-51 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Filling a Portable Fuel Container 6-8 . . . . . . . . . . . . . . . . . . . .
Filling Your Tank 6-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Filter, Air 6-20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Finish Care 6-55 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .