2003 PONTIAC BONNEVILLE cooling

How to Add Coolant to the Radiator
1. You can remove the radiator pressure cap when
the cooling system, including the radiator pressure
cap and upper radiator hose, is no longer hot.
Turn the pressure cap slowly counterclockwise until
it first stops. (Don’t press down while turning the
pressure cap.)
If you hear a hiss, wait for that to stop. A hiss
means there is still some pressure left.
2. Then keep turning the pressure cap, but now push
down as you turn it. Remove the pressure cap.
5-36

9. Put the cap back on the coolant recovery tank, but
leave the radiator pressure cap
off.
11. By this time, the coolant level inside the radiator
filler neck may be lower.
If the level is lower, add
more of the proper
DEX-COOL@ coolant mixture
through the filler neck until the level reaches
the base
of the filler neck.
12. Then replace the
pressure cap. At any
time during this
procedure
if coolant
begins to
flow out
of the filler neck,
reinstall the
pressure cap.
IO. Start the engine and let it run until you can feel the
upper radiator hose getting hot. Watch out for the
engine cooling fans. Be
sure the arrow on the pressure cap lines
up like this.
5-39

Each new wheel should have the same load-carrying
capacity, diameter, width, offset and be mounted
the same way as the one
it replaces.
If you need to replace any of your wheels, wheel bolts
or wheel nuts, replace them only with new
GM
original equipment parts. This way, you will be sure to
have the right wheel, wheel bolts and wheel nuts
for your vehicle.
Notice: The wrong wheel can also cause problems
with bearing life, brake cooling, speedometer or
odometer calibration, headlamp aim, bumper height,
vehicle ground clearance and tire or tire chain
clearance to the body and chassis.
See
Changing a Flat Tire on page 5-73 for more
information.
Used Replacement Wheels
Using the wrong replacement wheels, wheel
bolts or wheel nuts on your vehicle can be
handling of your vehicle, make your tires lose
air and make you lose control. You could have
a collision
in which you or others could be
injured. Always use the correct wheel, wheel
bolts and wheel
nuts for replacement.
~ dangerous. It could affect the braking and Putting a us
wheel o ~OL licle is
dangerous. You can’t know how it’s been used
or how far it’s been driven.
It could fail
suddenly and cause a crash. If you have to
replace a wheel, use a new GM original
equipment wheel.
I
5-70

Relays
27
28
29
30
31
32
33
34
35
36
37
38
39
40
Usage
Headlamp High Beam
Headlamp Low Beam
Fog Lamps
Daytime Running Lamps
Horn
Air Conditioning Clutch
HVAC Solenoid
Accessory
Not Used
Starter 1
Cooling Fan 1
Ignition
1
Cooling Fan Series/Parallel
Cooling Fan
2
Circuit
Breakers
41
Fuses
42
43
44
45
46
47
48
49
50
51
52
53
Usage
Starter
Usage
Not Used Not Used
Antilock Brake System
Not Used
Cooling Fan 1
Cooling Fan
2
Spare
Spare
Spare Spare
Spare
Fuse Puller
5-94

Capacities and Specifications
The following approximate capacities are given in English and metric conversions. Please refer to
Part D: Recommended Fluids and Lubricants on page 6-24 for more information.
Capacities
Capacities
Application English Metric
Automatic Transaxle
7.4 quarts 7.0 L
Engine Cooling System
10.0 quarts 9.5 L
Engine Oil with Filter
4.5 quarts 4.3 L -
Fuel Tank 18.5 gallons 70.0 L
Wheel Nut Torque 1 00 Ib-ft 140 Nam
Air Conditioning Refrigerant R134a 2.2 Ibs. 1 .O kg
All capacities are approximate. When adding, be sure to fill to the appropriate level, as recommended in this
manual. Recheck fluid level after filling.
Engine Specifications
5-1 00

6 Maintenance Schedule
Maintenance Schedule ...................................... 6.2
Introduction
................................................... 6.2
Your Vehicle and the Environment
.................... 6-2
Maintenance Requirements
.......................... 6.2
How This Section is Organized
..................... 6-3
Selecting the Right Schedule
........................... 6-5
Part
A: Scheduled Maintenance Services
........... 6.4
Using Your Maintenance Schedule
.................... 6-4
Short Trip/City Scheduled Maintenance
.............. 6-6
Long Trip/Highway Scheduled Maintenance
...... 6-13
Part
B: Owner Checks and Services ................ 6-18
At Each Fuel Fill
.......................................... 6-18
At Least Once a Month 0- IO P 40 .................................
At Least Twice a Year ................................... 6.19
At Least Once a Year
................................... 6.19
Part C: Periodic Maintenance Inspections
......... 6.22
Steering, Suspension and Front Drive Axle
Boot and Seal Inspection
............................ 6-22
Exhaust System Inspection
........................... -6-22
Fuel System Inspection
.................................. 6-22
Engine Cooling System Inspection
................... 6-23
Throttle System Inspection
............................. 6-23
Brake System Inspection
................................ 6-23
Part
D: Recommended Fluids and Lubricants .... 6-24
Part
E: Maintenance Record ........................... 6-26
6- 1

Selecting the Right Schedule
First you’ll need to decide which of the two schedules is
right for your vehicle. Here’s how to decide which
schedule to follow:
Follow the Short Trip/City Scheduled Maintenance
if any
one of these conditions is true for your vehicle:
0 Most trips are less than 5 miles (8 km). This is
particularly important when outside temperatures
are below freezing.
0 Most trips include extensive idling (such as frequent
0 You frequently tow a trailer or use a carrier on top
driving in
stop-and-go traffic).
of your vehicle.
0 If the vehicle is used for delivery service, police,
One of the reasons you should follow this schedule if
you operate your vehicle under any of these conditions
is that these conditions cause engine oil to break
down sooner.
taxi or other commercial application.
Short TriplCity Intervals
Every 3,000 Miles (5 000 km): Engine Oil and Filter
Change (or
3 months, whichever occurs first).
Every 6,000 Miles (IO 000 km): Tire Rotation.
Every 15,000 Miles (25 000 km): Engine Air Cleaner
Filter Inspection,
if driving in dusty conditions.
Every 30,000 Miles (50 000 km): Engine Air Cleaner
Filter Replacement. Supercharger Oil Check
(or every
36 months, whichever occurs first)
(3800 Code 1 V6 engine only).
Every 50,000 Miles (83 000 km): Automatic Transaxle
Service (severe conditions only).
Every 100,000 Miles (166 000 km): Spark Plug Wire
Inspection. Spark Plug Replacement. Automatic
Transaxle Service (normal conditions).
Every 150 000 Miles (240 000 km): Cooling System
Service [nr every 60 months, whichever nccIJrs
first). Engine Accessory Drive Belt Inspection.
These intervals only summarize maintenance services.
Be sure to follow the complete scheduled maintenance
on the following pages.
6-5

Long Trip/Highway Definition
Follow this scheduled maintenance only if none of the
conditions from the Short Trip/City Scheduled
Maintenance are true.
Do not use this schedule if the
vehicle
is used for trailer towing, driven in a dusty area
or used
off paved roads. Use the Short Trip/City
schedule for these conditions
Driving a vehicle with a fully warmed engine under
highway conditions will cause engine oil to break down
slower.
Long Trip/Highway Intervals
Every 7,500 Miles (12 500 km): Engine Oil and Filter
Change (or every 12 months, whichever occurs
first). Tire Rotation.
Every 30,000 Miles (50 000 km): Supercharger Oil
Check (or every 36 months, whichever occurs first)
(3800 Code 1 V6 engine only). Engine Air Cleaner Filter
Replacement.
Every 50,000 Miles (83 000 km): Automatic Transaxle
Service (severe conditions only).
Every 100,000 Miles (166 000 km): Spark Plug Wire
Inspection. Spark Plug Replacement. Automatic
Transaxle Service (normal conditions).
Every 150,000 Miles (240 000 km): Cooling System
Service (or every 60 months, whichever occurs
first). Engine Accessory Drive Belt Inspection.
These intervals only summarize maintenance services.
Be sure to follow the complete scheduled maintenance
on the following pages.
Short Trip/City Scheduled
Maintenance
The services shown in this schedule up to 100,000 miles
(1 66
000 km) should be repeated after 100,000 miles
(166
000 km) at the same intervals for the life of
this vehicle. The services shown at 150,000 miles
(240 000 km) should be repeated at the same interval
after 150,000 miles (240
000 km) for the life of this
vehicle.
See
Part B: Owner Checks and Services on page 6-18
and Part C: Periodic Maintenance Inspections on
page 6-22.
6-6