Toyota Yaris Air Conditioner Not Working

My A/c Or Heater Does Not Work, It Does Not Blow Anything Out Of The Vents. I Can Hear Compressor Kick On And The Fan That Cools The Engine...

My Air Conditioner In My Yaris Was Working Great,now Sometimes When I Start The Car The Air Conditioner Does Not Work, Sometimes It Does...

The Ac Gives Fully Chilled Air But After Operation Of About Half An Hour It Stops Working And Blows Warm Air. But After Three To Five...