Mine was doing that. But then my waterpump had a small leak so they had to drain almost all of the coolant and refill it when installing a new waterpump. Then that problem went away. People have told me that I may just need a coolant flush when my A/C was blowing warm. It worked for me but I have no idea if this is true info or just a coincidence. But have you had a coolant flush ever?

 

I have the same problem, but was told by a Dealership that this was normal, that you need a large air flow to push the cold air.... so they suggested that I could always step up the fan manually or move the temperature down and the climate control will step up the fan for me... if anyone knows more I would appreciate knowing too.... also the dealership told me the hissing noise from the firewall where the coolant pipes goes in was normal too (I though it was leaking).