Seems weird all the other vents are blowing hot air but the driver vent is blowing cold air. At first I was thinking that the vent hose was off but air was blowing pretty good. Anyone had this happen and what was the cause/fix?

 

Changed the cabin filter which were very dirty. This helped a bunch.

 

Once a year change those engine air and cabin air filters if your RX8 is a daily driver. My engine and cabin get changed at 10 month intervals 'cause of the air quality in SW Ohio. If it's dark, change it.