I dont have a F150, but in my old 95 contour, it was under the cowl (where the hood meets near the windshield). I had to remove a cover, then pop open some clips to pull the filter housing out. There might be another (or the only one) under the dash on the passenger side.
I don't think 1999 F150 had a cabin air filter option. I have never seen an F150 with a cabin air filter, and all the guys around here I have asked have never seen one either.
2006 f150 xl cabin air filter location
It does not have a cabin filter.
no
this vehicle does not come with a cabin air filter
yes
An 08 F150 Harley Edition does have a cabin air filter located on it. Furthermore, the F180 Harley Edition has a fuel filter located in the engine compartment.
It doesn't have one!
Purchase a Purolator filter as it comes with complete instructions. I think you will find that a 1998 F150 does not have a cabin filter.
You do not list what year it is and expect an answer. All I can tell you is to purchase a Purolator Cabin Filter for your truck, as it comes with complete instructions.
It is under the coweling, passenger side below the windshield wiper. Some don't have a filter in them for what ever reason, so don't depend on looking for an old one to find the spot.
It doesn't have an in cabin air filter for that year. There is an after market kit that can be installed to provide this feature if required.