1994 GMC Sonoma Owner's Manual - Page 308

Periodic Maintenance Inspections Listed below are inspections and services which should be performed at least twice ayear (for instance, each spring and fall). You should let your GM dealer's service department or other qualified service center do these jobs. Make sure any necessary repairs are completed at once. Steering and Suspension Inspection-{- Inspect front and rear suspension and steering system for damaged, loose or missing parts, signs of wear or lack of lubrication. Inspect power steering lines and hoses for proper hook-up, binding, leaks, cracks, chafing,etc. Lubricate the steering linkage. Accelerator Control System- Lubricate all pivot points with engine oil, except the TBI throttle shaft. Do not lubricate the cam pulley. Remove all external deposits from pulley. Do not oil any accelerator or cruise control cables. Replace any cables that have high effort or excessive wear. Exhaust System Inspection Inspect the complete 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 conditionswhich could cause a heat buildup in the floor pan or could let exhaustfumes seep into the passenger compartments. See "Engine Exhaust" in the Index. Drive Axle Service Check readfront axlefluid level and add as needed. Check constant velocity joints and axle seals for leaking. Transfer Case (four-wheel drive) Inspectionj* Every 12 months or at oil change intervals, check front axleand transfer case and add lubricant when necessary. Check vent hose at transfer case forkinks and proper installation. More frequent lubrication may be required on off-road use. ?A fluid loss in these systems may indicate a problem. Have them inspected and repaired at once.