Air conditioner switch is on with green light and air coming out but no cool air

Thanks for your reply. After your suggestion I located the compressor and the High pressure and low pressure valve. The other thing I have noticed is that when I switch on the A/c there is no change in sound. With little knowledge I have, there should be some clutch sound when the a/c is switch on. The belt on the compressor is rotating even when the a/c is switched off. Not sure if that should happen. When I switch on the a/c, there is no change in sound except that the fans in front of condenser starts rotating.

I am sure you have this fixed by now... but for future reference, your A/C clutch with not turn on unless there is the proper amount of refrigerant (Freon) pressure in the system. This is to protect the compressor, as running with improper pressure with damage the compressor.