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Need to find the air leak, go back through and make sure everything is tight, check for damaged mating surfaces as well. Check the fuel filter and make sure they didn't double gasket it, by accidentally leaving the old filter gasket in place.
This looks like package type unit. your filters should be located inside the home where ever the air return is. You can find most any size filter at any home improvement store or locate a Baker Distrib. company branch and buy by the case. Steve
your behicle did not come with one from the factory.
SECTION 412-01: Air Distribution and Filtering
2001 F-150 Workshop Manual
DESCRIPTION AND OPERATION
NOTE: A cabin air filter is available as a dealer installed accessory for the air distribution system of this vehicle. The instructions for installation and servicing of the cabin air filter are included with the filter when purchased.