GMC C series 2002 Owner's Manual page 303

(23) = Wheel bearing service:
D
--
Grease type Clean, inspect and lubricate with the
proper wheel bearing grease at designated intervals
or when hubs are removed. See "Recommended
Fluids and Lubricants" in the Index.
D
- --
Oil filled type Some wheel bearings are lubricated
by rear axle lubricant. When you have oil
hubs, use lubricant identical to that used in your rear
axle. Lubricant change intervals are the same for
front and rear axles. However, you must maintain oil
level at the OIL LEVEL mark between change
intervals. See "Recommended Fluids and
Lubricants" in the Index.
(24) = Check the air intake system installation to see
that gaskets are seated properly and all hose
connections, fasteners and other components are tight.
For gasoline engines, also check to be sure the air
cleaner housing is properly seated, that the cover fits
tightly and that the wing nut is tight. Tighten
connections and fasteners or replace parts as required.
7-22
(26) = Evaporative Control System Service
(if equipped): Check all fuel and vapor lines and hoses
for proper connections and any damage (or every
24 months, whichever occurs first). Replace parts as
needed.
(27) = Replace engine air cleaner filter (or every
24 months, whichever occurs first). Replace filter
-
filled
more often if driving in dusty conditions. Ask your
dealer for the proper replacement intervals for your
driving conditions.
(28) = Replace spark plugs. Inspect wires for damage.
Check the wire boot and boot heat shield fit at spark
plugs and coil. Replace parts as needed.
(30) = Check the fuel tank, fuel cap and fuel lines for
damage which could cause leakage. Inspect fuel cap and
gasket for any damage. Check fuel cap gasket for even
filler neck imprint. Replace parts as needed.
(31) = Check EGR system as described in the service
manual. See "Service and Owner Publications" in
the Index.
(32) = Inspect Electronic Vacuum Regulator Valve
(EVRV) filter for excessive contamination or plugging.
If needed, clean filter with solution of soap and water,
let dry and install.