2004 Lincoln Navigator Owner Guide 3rd Printing (Spanish) - Page 770

Maintenance and Specifications 2. Loosen the clamp that secures the air filter cover to the air filter housing and carefully separate the cover from housing. 3. Remove the air filter element from the air filter housing. 4. Install a new air filter element. Be careful not to crimp the filter element edges between the air filter housing and cover. This could cause filter damage and allow unmetered air to enter the engine if not properly seated. 5. Replace the air filter cover and secure the clamp. 6. Replace the air inlet tube and secure the clamp. INFORMATION ABOUT UNIFORM TIRE QUALITY GRADING New vehicles are fitted with tires that have a rating on them called Tire Quality Grades. The Quality grades can be found where applicable on the tire sidewall between tread shoulder and maximum section width. For example: • Treadwear 200 Traction AA Temperature A These Tire Quality Grades are determined by standards that the United States Department of Transportation has set. 346