Pulled front bumper and cleaned all debri. I could not believe the crap that gets in there. Our vents are like a big vac cleaner, pulled cig butts and tumble weeds and plain dust dirt. Even between the radiator and condensor there was crap and alot of it. To further protect filtration I fabbed these up from rain gutter plastic. they come 6in wide by about 6ft. IT took me about 45 min to do. Less than $5 a roll of this stuff so very cost effective. Cut out cardboard shape then trace over to mesh. I fastened to hoirzontal grids with bobby pins! Step back ten feet and it passes my visual. be sure to blow out the radiators with compressed air too.