2003 BUICK CENTURY coolant temperature

90,000 Miles (150 000 km)
qReplace passenger compartment air ®lter. If you
drive regularly under dusty conditions, the ®lter
may require replacement more often.
qReplace engine air cleaner ®lter. See
Engine Air
Cleaner/Filter on page 5-18for more information.An Emission Control Service.
qRotate tires. SeeTire Inspection and Rotation on
page 5-60for proper rotation pattern and additional
information.(See footnote .) (See footnote +.)
97,500 Miles (162 500 km)
qRotate tires. SeeTire Inspection and Rotation on
page 5-60for proper rotation pattern and additional
information.(See footnote .) (See footnote +.)
100,000 Miles (166 000 km)
qInspect spark plug wires.An Emission Control
Service.
qReplace spark plugs.An Emission Control Service.
qChange automatic transaxle ¯uid and ®lter if the
vehicle is mainly driven under one or more of
these conditions:
þ In heavy city traffic where the outside
temperature regularly reaches 90ÉF (32ÉC)
or higher.
þ In hilly or mountainous terrain.
þ When doing frequent trailer towing.
þ Uses such as found in taxi, police or delivery
service.
qIf you haven't used your vehicle under severe service
conditions listed previously and, therefore, haven't
changed your automatic transaxle ¯uid, change both
the ¯uid and ®lter.
150,000 Miles (240 000 km)
qDrain, ¯ush and re®ll cooling system (or every
60 months since last service, whichever occurs ®rst).
See
Engine Coolant on page 5-23for what to use.
Inspect hoses. Clean radiator, condenser, pressure
cap and neck. Pressure test the cooling system
and pressure cap.
An Emission Control Service.
qInspect engine accessory drive belt.An Emission
Control Service.
6-9

Child Restraints (cont.)
Infants and Young Children...........................1-32
Lower Anchorages and Top Tethers for
Children (LATCH System)..........................1-42
Older Children.............................................1-30
Securing a Child Restraint Designed for the
LATCH System........................................1-45
Securing a Child Restraint in a Center Rear
Seat Position...........................................1-48
Securing a Child Restraint in a Rear Outside
Seat Position...........................................1-45
Securing a Child Restraint in the Right Front
Seat Position...........................................1-50
Top Strap Anchor Location............................1-42
Top Strap...................................................1-40
Where to Put the Restraint...........................1-39
Cigarette Lighter.............................................3-16
Cleaning Aluminum Wheels..............................5-84
Cleaning Exterior Lamps/Lenses.......................5-83
Cleaning Fabric/Carpet....................................5-79
Cleaning Glass Surfaces..................................5-81
Cleaning Interior Plastic Components.................5-81
Cleaning Leather............................................5-81
Cleaning the Top of the Instrument Panel...........5-81
Cleaning Tires................................................5-84
Cleaning Vinyl................................................5-81Cleaning Windshield and Wiper Blades..............5-83
Cleaning........................................................5-79
Inside of Your Vehicle..................................5-79
Outside of Your Vehicle................................5-82
Underbody Maintenance...............................5-85
Weatherstrips..............................................5-82
Climate Control System...................................3-20
Air Filter, Passenger Compartment.................3-20
Dual..........................................................3-17
Outlet Adjustment........................................3-20
Compact Disc Messages..................................3-47
Compact Spare Tire........................................5-78
Control of a Vehicle.......................................... 4-6
Convenience Net............................................2-35
Coolant.........................................................3-30
Engine Temperature Gage............................3-30
Engine Temperature Warning Light.................3-29
Heater, Engine............................................2-21
Cooling System..............................................5-29
Courtesy Lamps.............................................3-14
Cruise Control Light........................................3-36
Cruise Control.................................................. 3-8
Current and Past Model Order Forms................7-12
Customer Assistance Information........................ 7-8
Courtesy Transportation.................................. 7-8
3

E
Electrical System............................................5-88
Add-On Equipment......................................5-88
Fuses and Circuit Breakers...........................5-89
Headlamp Wiring.........................................5-88
Power Windows and Other Power Options......5-88
Windshield Wiper Fuses...............................5-88
Emergency Trunk Release Handle.....................2-14
Emissions Inspection and Maintenance
Programs...................................................3-33
Engine Coolant Level Check.............................6-10
Engine Cooling When Trailer Towing..................4-41
Engine Oil Additives........................................5-16
Engine Oil Level Check...................................6-10
Engine Oil Scheduled Maintenance..................... 6-5
Engine..........................................................5-18
Air Cleaner/Filter.........................................5-18
Battery.......................................................5-42
Change Engine Oil Light...............................3-35
Check and Service Engine Soon Light............3-31
Compartment Overview................................5-12
Coolant Heater............................................2-21
Coolant Temperature Gage...........................3-30
Coolant Temperature Warning Light................3-29
Coolant......................................................5-23
Cooling System Inspection............................6-14Engine (cont.)
Exhaust.....................................................2-30
Oil .............................................................5-13
Overheating................................................5-26
Starting......................................................2-20
Enhanced Traction System (ETS)......................4-10
Warning Light.............................................3-28
Entry Lighting.................................................3-14
Express-Down Window....................................2-16
Extender, Safety Belt.......................................1-29
Exterior Lamps...............................................3-11
F
Filter.............................................................5-18
Engine Air Cleaner......................................5-18
Finding a Station....................................3-40, 3-42
Finish Care....................................................5-83
Finish Damage...............................................5-84
Fixed Mast Antenna........................................3-52
Flash-to-Pass................................................... 3-7
Flat Tire, Changing.........................................5-67
Flat Tire........................................................5-66
Fluid.............................................................5-19
Automatic Transaxle.....................................5-19
Power Steering...........................................5-36
Windshield Washer......................................5-38
5

FM ...............................................................3-50
Folding Rear Seat............................................ 1-6
Following Distance..........................................4-39
Footnotes........................................................ 6-5
Fuel............................................................... 5-5
Additives...................................................... 5-6
California Fuel.............................................. 5-6
Filling a Portable Fuel Container..................... 5-9
Filling Your Tank........................................... 5-7
Fuels in Foreign Countries.............................. 5-7
Gage.........................................................3-37
Gasoline Octane........................................... 5-5
Gasoline Speci®cations.................................. 5-5
Low Warning Light.......................................3-38
System Inspection.......................................6-14
Fuses...........................................................5-89
Fuses and Circuit Breakers...........................5-89
Windshield Wiper.........................................5-88
G
Gage............................................................3-30
Engine Coolant Temperature.........................3-30
Fuel..........................................................3-37
Speedometer..............................................3-24
Gasoline......................................................... 5-5
Octane........................................................ 5-5
Speci®cations............................................... 5-5Glove Box.....................................................2-35
GM Mobility Program for Persons with
Disabilities.................................................... 7-6
H
Hazard Warning Flashers................................... 3-3
Head Restraints............................................... 1-5
Headlamp High/Low-Beam Changer.................... 3-6
Headlamp Wiring............................................5-88
Headlamp......................................................5-49
Aiming.......................................................5-49
Headlamps....................................................5-51
Bulb Replacement.......................................5-51
Front Turn Signal and Parking Lamps.............5-52
Halogen Bulbs............................................5-51
Highway Hypnosis...........................................4-24
Hill and Mountain Roads..................................4-24
Hitches..........................................................4-38
Hood............................................................5-10
Checking Things Under................................5-10
Release.....................................................5-11
Horn............................................................... 3-4
How to Add Coolant to the Coolant
Recovery Tank............................................5-31
How to Add Coolant to the Radiator..................5-33
How to Add Fluid............................................5-22
6

LATCH System (cont.)
Securing a Child Restraint Designed for the
LATCH System........................................1-45
Leaving Your Vehicle With the Engine Running . . . 2-28
Leaving Your Vehicle.......................................2-12
Lighted Visor Vanity Mirrors..............................2-16
Light.............................................................3-25
Air Bag Readiness.......................................3-25
Anti-Lock Brake System Warning...................3-28
Brake System Warning.................................3-27
Change Engine Oil......................................3-35
Charging System.........................................3-26
Cruise Control.............................................3-36
Door/Trunk Ajar Warning...............................3-36
Engine Coolant Temperature Warning.............3-29
Enhanced Traction System (ETS) Warning
Light......................................................3-28
Low Fuel Warning.......................................3-38
Low Oil Level.............................................3-35
Low Traction...............................................3-29
Low Washer Fluid Warning...........................3-36
Malfunction Indicator....................................3-31
Oil Pressure...............................................3-34
Safety Belt Reminder...................................3-24
Security.....................................................3-36
Service Vehicle Soon...................................3-37
Tire Pressure..............................................3-30
Loading Your Vehicle.......................................4-33
Lockout Protection..........................................2-12
Locks............................................................2-10Door..........................................................2-10
Leaving Your Vehicle....................................2-12
Lockout Protection.......................................2-12
Power Door................................................2-11
Programmable Automatic Door Locks.............2-11
Loss of Control...............................................4-15
Low Fuel Warning Light...................................3-38
Low Traction Light..........................................3-29
Low Washer Fluid Warning Light.......................3-36
M
Maintenance, Normal Replacement Parts............5-95
Maintenance Schedule.....................................6-10
At Each Fuel Fill.........................................6-10
At Least Once a Month................................6-10
At Least Once a Year..................................6-11
At Least Twice a Year..................................6-11
Brake System Inspection..............................6-15
Engine Cooling System Inspection.................6-14
Exhaust System Inspection...........................6-14
Fuel System Inspection................................6-14
How This Section is Organized....................... 6-3
Introduction.................................................. 6-2
Maintenance Requirements............................. 6-2
Part A - Scheduled Maintenance Services......... 6-4
Part B - Owner Checks and Services.............6-10
Part C - Periodic MaintenanceInspections......6-14
Part D - Recommended Fluids and Lubricants . . . 6-16
8