2003 Oldsmobile Bravada cooling

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 be-
e you do it.
Steam and scalding liquids from a hot cooling
system can blow out and burn you badly. They are under pressure, and if you turn the radiator
pressure cap
-- even a little -- they can come
out at high speed. Never turn the cap when the
cooling system, including the radiator pressure
cap,
is hot. Wait for the cooling system and
radiator pressure cap to cool if you ever have
to turn the pressure cap.
5-29

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
about one full turn.
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. Remove the
pressure cap.
5-30

Engine Fan Noise
6. Start the engine and let it run until you can feel the
upper radiator hose getting hot. Watch out for the
engine cooling fan.
7. 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.
8. 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. Be sure
the pressure cap is hand-tight. This vehicle has a clutched engine cooling
fan. When
the clutch is engaged, the fan spins faster to provide
more air to cool the engine. In most everyday driving
conditions the clutch is not engaged. This improves fuel
economy and reduces fan noise. Under heavy vehicle
loading, trailer towing, and/or high outside temperatures,
the fan speed increases when the clutch engages.
So
you may hear an increase in fan noise. This is
normal and should not be mistaken as the transmission
slipping or making extra shifts.
It is merely the cooling
system functioning properly. The fan will slow down
when additional cooling is not required and the clutch
disengages.
You may also hear this fan noise when you start the
engine.
It will go away as the fan clutch disengages.
5-32

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.
Lb CAUTION:
Using the wrong replacement wheels, wheel
bolts or wheel nuts on your vehicle can be
dangerous.
It could affect the braking and
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.
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 clearance to the body and chassis.
See
Changing a Flat Tire on page 5-62 for more
information.
Used Replacement Wheels
Putting a used wheel on 1 lr vehicle 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.
5-59

Fuses
10
11 12
13 14
15 16
17
18
19
20
21 22
23
24
25
26
27
28
29
30
31
Usage
Powertrain Control Module B
Fog Lamps
Stop Lamp
Cigarette Lighter
Ignition Coils
Air Suspension Ride
TBD-Ignition
1
Crank
Air Bag
Electric Brake
Cooling Fan
Horn Ignition
E
Electronic Throttle Control
Instrument Panel Cluster, Driver
Information Center
Automatic Shift Lock Control System
Engine 1
Back-up Powertrain Control Module 1
Oxygen Sensor
Air Conditioning
Truck Body Controller
Fuses
32
33
34
35
36
50
51
52
Relays
37
38
39
40
41
42
43
44
45
46 47
Usage
Trailer
Anti-Lock Brakes (ABS) Ignition A
Blower Motor Ignition B Passenger’s Side Trailer Turn
Driver’s Side Trailer Turn
Hazard Flashers
Usage
Blank Rear Window Washer
Fog Lamps
Horn Fuel Pump
Windshield WipersNasher
High-Beam Headlamp
Air Conditioning
Cooling Fan
Headlamp Driver Module
Starter
Miscellaneous Usage
48 Instrument Panel Battery
49 Fuse Puller
5-89

6 Maintenance Schedule
Maintenance Schedule ...................................... 6-2
Introduction
................................................... 6-2
Maintenance Requirements
.............................. 6-2
How This Section is Organized ......................... 6-3
Part A: Scheduled Maintenance Services
........... 6-4
Using Your Maintenance Schedule
.................... 6-4
Scheduled Maintenance
................................... 6-5
Part
B: Owner Checks and Services ................ 6-10
At Each Fuel Fill
.......................................... 6-10
At Least Once a Month
................................. 6-10
At Least Twice a Year
................................... 6-11
Your
Vehicle and the Environment
.................... 6-2 At
Least Once a Year
................................... 6-12
Part
C: Periodic Maintenance Inspections ......... 6.15
Boot and Seal Inspection
............................ 6.15
Exhaust System Inspection
............................ 6.15
Fuel System Inspection
.................................. 6.15
Engine Cooling System Inspection
................... 6.15
Brake System Inspection
................................ 6-16
Part E: Maintenance Record
........................... 6.19
Steering, Suspension and Front Drive
Axle
Transfer Case and Front Axle
(All-Wheel Drive) Inspection
........................ 6.16
Part D: Recommended Fluids and Lubricants
.... 6-17
6- 1

100,000 Miles (166 000 km)
0 Replace spark plugs. An Emission Control Service.
0 Change automatic transmission fluid and filter if
the vehicle is mainly driven under one or more
of these conditions:
- In heavy city traffic where the outside
temperature regularly reaches
90°F (32°C) or
higher.
- In hilly or mountainous terrain.
- When doing frequent trailer towing.
- Uses such as found in taxi, police or delivery
service.
0 If you haven’t used your vehicle under severe service
conditions listed previously and, therefore, haven’t
changed your automatic transmission fluid, change
both the fluid and filter
U Change transfer case fluid.
150,000 Miles (240 000 km)
U Drain, flush and refill cooling system (or every
60 months since last service, whichever occurs first).
See
Engine Coolant on page 5-22 for what to use.
Inspect hoses. Clean radiator, condenser, pressure
cap and neck. Pressure test the cooling system
and pressure cap.
An Emission Control Service.
0 Inspect engine accessory drive belt. An Emission
Control Service.
6-9

Part C: Periodic Maintenance
Inspections
Listed in this part are inspections and services which
should be performed at least twice a year (for instance,
each spring and fall).
You should let your dealer’s
service department or other qualified service center do
these jobs. Make sure any necessary repairs are
completed at once.
Proper procedures to perform these services may be
found in a service manual. See
Service Publications
Ordering Information
on page 7- 10.
Steering, Suspension and Front
Drive Axle
Boot and Seal Inspection
Inspect the front and rear suspension and steering
system for damaged, loose or missing parts, signs of
wear or lack of lubrication. Inspect the power steering
lines and hoses for proper hook-up, binding, leaks,
cracks, chafing, etc. Clean and then inspect the drive
axle boot seals for damage, tears or leakage. Replace
seals
if necessary.
Exhaust System Inspection
Inspect the complete exhaust system. Inspect the body
near the exhaust system. Look for broken, damaged,
missing or out-of-position parts as well as open seams,
holes, loose connections or other conditions which
could cause a heat build-up in the floor pan or could let
exhaust fumes into the vehicle. See
Engine Exhaust
on page 2-28.
Fuel System Inspection
Inspect the complete fuel system for damage or leaks.
Engine Cooling System Inspection
Inspect the hoses and have them replaced if they
are cracked, swollen or deteriorated. Inspect all pipes,
fittings and clamps; replace as needed. Clean the
outside of the radiator and air conditioning condenser.
To help ensure proper operation, a pressure test
of
the cooling system and pressure cap is recommended
at least once a year.
6-1 5