CHEVROLET S-10 AIR CONDITIONER BLOWS HOT

My 99 S10 Has 78k And A V6 Vortec Engine. The Ac Is Blowing Out Extremely Hot Air. I Tried Charging The System With One Of Those Cans Of...

There Is No Cool Air Coming Through Any Vents. It Is Even Shut Off And Has Extreme Heat Coming Out. Air Conditioner Has No Freon. Clutch...

This Might Sound Weird But My Air Conditioner Starts Blowing Cold And Stays That Way For About 10 To 15 Minutes And Then Turns Hot. If I...