2001 GMC Sierra 1500 Pickup Owner's Manual - Page 438

Scheduled Maintenance -- Gasoline Engines j If Equipped: Replace passenger compartment air filter. If you drive regularly under dusty conditions, the filter may require replacement more often. j Check rear/front axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking. j Rotate tires. See "Tire Inspection and Rotation" in the Index for proper rotation pattern and additional information. (See footnote +.) j Inspect engine accessory drive belt. An Emission Control Service. j Replace fuel filter. 60,000 Miles (100 000 km) DATE ACTUAL MILEAGE SERVICED BY: An Emission Control Service. (See footnote[.) j Inspect Exhaust Gas Recirculation (EGR) system as described in the service manual. An Emission Control Service.(See footnote [.) j Inspect Evaporative Control System. Check all fuel and vapor lines and hoses for proper hook-up, routing and condition. Check that the purge valve works properly, if equipped. Replace as needed. An Emission Control Service. (See footnote [.) 7-13