american standard freedom 90 just blows cold air
So what exactly is happening...IF Nothing, then it is not the filter. That would only come into play if the furnace ran for a while then locked out due to over temp which could be due to system air flow problems/plugged filter etc.
Does the ID fan come on..if so, then what..describe and we will go from there.
I think you found your filters and by the looks of your pics there isn't any duct work below the furnace so, no filters in crawl space. But then pics are not all inclusive but don't be discouraged if you do not find filters there.
Turn power off to furnace at furnace switch then .turn stat up ..turn
furnace switch ON and observe sequencing, if any...Get back to us