1995 GMC Yukon Owner's Manual - Page 451

Maintenance Schedule II - Diesel Engines 0 Inspect shields and underhood insulation for damage or looseness. Adjust or replace as required. This is a Noise Emission Control Service. Applicableonly to vehicles sold in the United States. properly sealed and that all hose connections, fasteners and other components are tight. Also check to be sure that the air cleaner housing is properly seated, the cover fits tightly and the wing nuts are tight. Tighten connections and fasteners or replace damaged parts as necessary. This is a Noise Emission Control Service. Applicable only to vehicles sold in United States. the If your engine has a thermostatically controlled cooling fan, inspect all hoses and ducts for proper hook-up (or every I2 months, whichever occurs first). Be sure the valve works properly. This is a Noise Emission Control Service. Applicable only to vehicles sold in the United States. 0 Check the air intake system installation to assure that gaskets are 0 Check rear/front axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking. DATE ACTUAL MILEAGE SERVICED BY: i 25,000 Miles (40000 km) 0 Change engine o i l and filter (or every 3 months, whichever occuTs first). AIIEmission C m t - d Service. I7 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 10" 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 a t this mileage interval (or every 12 months, whichever occurs first). 7-83