1995 GMC Yukon Owner's Manual - Page 416

Maintenance Schedule I - Gasoline Engines Heavy Duty Emissions (Continued) 0 Inspect accessory drive (serpentine) belt for cracks, fraying and wear and check belt for proper tension. Adjust or replace belt as needed. An. Emission Control Service. 0 Inspect shields and underhood insulation for damage or looseness. Adjust or replace as required. This is a Noise Emission Control Service. Applicable only to vehicles sold the United States. in 0 Check the air intake system installation to assure that gaskets are properly sealed and that all hose connections, fastenersand 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 fdsteners or replace damaged parts as necessary. This is a Noise Emission Control Service. Applicable only to vehicles sold in the United States. 0 If your engine has a thermostatically controlled cooling fan, inspect all hoses and ducts for proper hook-up (or every 12 months, whichever occurs first).Be sure the valve works properly. This is a Noise Emission Control Service. Applicable only to vehicles soldthe in United States. ~ DATE ACTUAL MILEAGE SERVICED BY: . 50,000 Miles ( 3 000 km) 8 0 Change transmission fluid and filter if the vehicle is mainly driven under one ormore of these conditions: 0 In heavy city traffic where the outside temperature regularly reaches 90°F (32°C) or higher. 0 0 In hilly or mountainous terrain. When doing frequent trailer towing. (Continued) 7-48