You should replace the air filter with a new one at specified intervals, and periodic inspections should occur as part of a preventive maintenance program, particularly when the car is constantly driven on dusty roads. The air filter sits in the air cleaner housing attached at the top of the carburetor on conventional models and at the right front corner of the engine compartment on fuel-injected models. In carbureted models, first, unclamp the clips, and then release the wing nut, which will allow you to lift the top plate from the air cleaner housing. After that, take out the air filter from the housing; replace it if it is dirty. Using a rag, wipe the inside of the air cleaner housing and replace the top plate. If the old filter is in acceptable condition, put it back into the housing. If it is not in good condition, place a new filter in the housing. Tighten the wing nut and snap the clips into place. For fuel injected models with round filter housing remove intake air hose, unclip, and pull out air flow sensor from housing. Take out the old filter element (do not touch the air flow sensor, when present), and replace it if dirty. Install the new filter element aligning the tabs to the air flow sensor body and install the clips. Lastly, attach the air intake hose, making sure there are no air leaks. Remove the clips on the rectangular filter housing, pull the cover up, and lift the filter. If it's dirty, replace it. Wipe the inside of a housing, put the old or new filter inside, place the cover back on, and put on the clips.