where is an air filter located on a car?

Answer 1

usually either on top of the engine, underneath, the metal case (BIG circular thing, unscrew the wingnut) or on the hoses to the intake, usually in front and to the right of the engine, if you are facing the car from the front. In this case it will be in a box looking thing, and you'll have to unscrew 4 screws, and probably take off the hose to the intake.

Answer 2

On older cars with carburetors, they were on the top in the middle of the engine. Now they are usually in a box on either side of the engine near the front fender.