I haven't had any AC problems until recently on an 07 Fit Sport (manual transmission). I suspect it's the blend doors but I don't really know. The fan blow became weaker and weaker but always stayed. The more I played with the controls, the weaker the air flow volume got. Finally it has almost no airflow. I can hear the blower motor stepping through all 3 power settings as one would expect. But, I don't know if somehow the blower is circulating air around in a closed loop. When I select the air output location (full front, front & legs, legs only, windshield), there seems to be no change in air output location. Could this be the blend doors somehow completely shutting?

If it's the blend doors, is there a diagram showing where it is? I've looked online and looked for videos about fixing the Fit but it seems everything I found is for the Accord.

Any advice?
Thanks

 

best I could find for a 2008

 

Super easy to access. Grab a 10 mm and your 1/4" ratchet. Drop your glove box and you'll see two cables above the blower motor. Actuate your controls to make sure the housing for the cable remains stationary while the cable is pulled through. Turn on blower motor and make sure air isn't blowing through somewhere it shouldn't be.

Let us know what you find!

 

If this only occurs when you're using your AC, this is a symptom of the evaporator freezing up, likely caused by low refrigerant, which itself would be caused by a leak.