1995 GMC Yukon Owner's Manual - Page 415

Maintenance Schedule I - Gasoline Engines Heavy Duty Emissions 48,000 Miles (80 000 km) Change engine oil and filter (or every 3 months, whichever occurs first). A H Emissior1 Corztrol Ser-rvke. Lubricate the front suspension, king pin bushings, steering linkage, transmission shift linkage, transfer case shift linkage, parking brake cable guides, rear driveline center splines,front axle propshaft splines, brake pedal springs and clutch pedal springs. Ball joints and king pin bushings should not be lubricated unless their temperature is IO" F (- 12" C), or higher. When weather is cold, let the ball joints and king pin bushings warm up before lubrication or they could be damaged. Perform each of the listed lubrication service items at this mileage interval (or every 12 months, whichever occurs first). Check rear/front axle fluid level and add fluid as needed. Check constant velocity joints and axle seals forleaking.'1:*' Drain, flush and refill the cooling system with new coolant (or every 24 months, whichever occurs first). See "Engine Coolant" in the Index for what to use. AIZEmission Corztrol Service. Also inspect the hoses and replace them if they are cracked, swollen or deteriorated. Tighten all hose clamps (except constant tension clamps). Remove debris and clean the outside of the radiator and air conditioning condenser. Wash the radiator neck. To ensure proper operation, pressure test the radiator and cap. Replace air cleaner filter. Replace filter more often under dusty conditions. An Emission Contr-ol Service. 0 For 2-Wheel Drive vehicles only: Clean and repack the front wheel bearings (or at each brake relining, whichever occurs first). 0 Replace fuel filter. Replace filter soonerif it is clogged.? 0 Adjust timing to underhood label specifications. Inspect the inside and outside of the distributor cap and rotor for cracks. carbon tracking and corrosion. Clean or replace a s needed. An Ernissior~Control Service. This is a Noise Emission Control Service. 0 If your vehicle has a thermostatically controlled air cleaner, inspect all hoses and ducts forproper hook-up. Be sure the valve works properly. An Emissiorz Corztrol Service. This is a Noise Emission Control Service. (Continued) 7-47