fuel cap GMC SONOMA 2002 User Guide

6-13
Engine Oil
Checking Engine Oil
It's a good idea to check your engine oil every time you
get fuel. In order to get an accurate reading, the oil must
be warm and the vehicle must be on level ground.
The engine oil dipstick
handle on the ªVORTECº
2200 L4 engine is under
the fill cap.
The engine oil dipstick
handle on theªVORTECº
4300 V6 engine is a
yellow ring.
See ªEngine Compartment Overviewº in the Index for
more information on location.
Turn off the engine and give the oil several minutes to
drain back into the oil pan. If you don't, the oil dipstick
might not show the actual level.

6-48 Inflation -- Tire Pressure
The Certification/Tire label, which is on the driver's
door edge, above the door latch, shows the correct
inflation pressures for your tires when they're cold.
ªColdº means your vehicle has been sitting for at least
three hours or driven no more than 1 mile (1.6 km).
NOTICE:
Don't let anyone tell you that underinflation or
overinflation is all right. It's not. If your tires
don't have enough air (underinflation), you can
get the following:

Too much flexing

Too much heat

Tire overloading

Bad wear

Bad handling

Bad fuel economy
NOTICE: (Continued)
NOTICE: (Continued)
If your tires have too much air (overinflation),
you can get the following:

Unusual wear

Bad handling

Rough ride

Needless damage from road hazards
When to Check
Check your tires once a month or more. Also, check the
tire pressure of the spare tire.
If you have a compact spare tire, it should be at
60 psi (420 kPa).
How to Check
Use a good quality pocket
-type gage to check tire
pressure. You can't tell if your tires are properly inflated
simply by looking at them. Radial tires may look
properly inflated even when they're underinflated.
Be sure to put the valve caps back on the valve stems.
They help prevent leaks by keeping out dirt and
moisture.

6-72
Replacement Bulbs*
Lamps Number
Halogen Headlamps,
Composite Low
-Beam9006 HB4 or
9006 LL
Halogen Headlamps,
Composite High
-Beam9005 HB3
Tail and Stoplamps 3057
Rear Sidemarker Lamps 194
Front Sidemarker Lamps 194NA
Front Turn Signal Lamps 3457A
Center High
-Mounted
Stoplamp211-2
*For replacement bulbs not listed here, please consult
your dealer.
Capacities and Specifications
Please refer to ªRecommended Fluids and Lubricantsº
in the index for more information. See refrigerant
change label under the hood for charge capacity
information and requirements.
Wheel Nut Torque100 lb
-ft (140 N´m) . . . . . . . . . .
Tire PressureSee the Certification/Tire label. . . . . . .
See ªLoading Your Vehicleº in the Index.
Cooling System
2.2L Engine 9.9 quarts (9.4 L). . . . . . . . . . . . . . . . .
4.3L Engine w/Auto. Trans. 13.8 quarts (13.1 L). .
4.3L Engine
w/Manual. Trans. 14.1 quarts (13.3 L). . . . . . . .
Engine Oil with Filter*
2.2L Engine 4.5 quarts (4.3 L). . . . . . . . . . . . . . . . .
4.3L Engine 4.5 quarts (4.3 L). . . . . . . . . . . . . . . . .
Fuel Capacity
Reg./Ext. Cab 18.5 U.S. Gallons (70.0 L). . . . . . . .
Crew Cab 17.8 U.S. Gallons (67.4 L). . . . . . . . . . . .

7-52 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.
Throttle System Inspection
Inspect the throttle system for interference or binding,
and for damaged or missing parts. Replace parts as
needed. Replace any components that have high effort
or excessive wear. Do not lubricate accelerator and
cruise control cables.
Transfer Case and Front Axle
(Four-Wheel Drive) Inspection
Every 12 months or at engine oil change intervals, check
front axle and transfer case and add lubricant when
necessary. A fluid loss could indicate a problem; check
and have it repaired, if needed. Check vent hose at
transfer case for kinks and proper installation. More
frequent lubrication may be required on off
-road use.
Brake System Inspection
Inspect the complete system. Inspect brake lines and
hoses for proper hook
-up, binding, leaks, cracks,
chafing, etc. Inspect disc brake pads for wear and rotors
for surface condition. Also inspect drum brake linings
for wear and cracks. Inspect other brake parts, including
drums, wheel cylinders, calipers, parking brake, etc.
Check parking brake adjustment. You may need to have
your brakes inspected more often if your driving habits
or conditions result in frequent braking.