A/C only blows while driving

I think he's talking about the flow of refrigerant through the system

 

I had the same problem with a Maxima, but heat not a/c. Hot heat only at high revs. Cold air at stop lights. Had a plugged or restricted coolant line or heater core. Disregard if my comment here doesn't move with your a/c problem.

 

Its your cabin air filter. Pull your glovebox and change your filter. I know it sounds simple, but I’ve been there and done that.

 

Make sure to check your cabin air filter! I noticed that my A/C worked well while driving, but it would become warm when idling at traffic lights.

After reading about similar issues, I decided to inspect my cabin air filter. While doing so, I discovered that some paperwork from the glove box had fallen over the return air intake, blocking airflow from the cabin. Once I removed the paperwork, my problem was resolved.