I have a 2009 F150. The AC is not blowing with much power. It blows cold air and the blower seems to be running hard. But its not putting out the air it should. It seems to be the max air is not blowing properly. As I understand, 09's do not have a cabin filter. Any suggestions on what it can be?

TIA!!

 

If the speed of the blower motor seems normal and you can control it using your head unit and you're just not getting the volume of airflow you should, then the evaporator core may be clogged with dust, pollen, or other debris.

This is common in very dusty or dirty operating environments.