AC has been recharged and still won't blow cold air unless truck is moving at above 30 MPH.

This truck only had 118k miles at the time this problem arose.

try to charge freon, high side pipe got frozen, compressor working but no cold air

A/C goes out intermittently. When idling it is ok, but as soon as I hit over 35mph, you hear a noise and then it goes out and blows hot air.