New to this forum....thanks for having me.
Little back ground, the car is a 2018 Accord with 1.5 turbo. Tried using a/c this year but all I had was warm air. Changed cabin air filter which resulted in some what cool air.

Now yesterday a/c was working normal? Then started getting warm air out of left vent located center dash above controls.
Thinking this maybe a blend door issue. Problem is I can't seem to find any info on web that describes location of the blend doors.
Any help would be appreciated ...thanks

 

The blend doors are inside the plastic heater unit. The air temperature is set at the control. The blend door mixes the cold a/c air with warm air to obtain temperature, then the air comes out of the vents that are open. Each vent doesn't have its own blend door. The only temperature difference you should have is if you can set the driver's side to a different temp vs the passenger side.