2007 vnl 670 ac problem

Hi guys , I couldnt find the answer for my problem. Sorry if there was the same question before. Two weeks ago I noticed my heat stopped working in the cab (sleeper working fine), now we had a couple warm days and I tried to run the ac but it didnt work. I charger the ac and I had kind of cold air but not as cold as last summer. I drove 100 miles to the customer and it stopped working once I parked.I noticed then the line that goes from ac compressor to the condenser is really hot. Now ac gives me warm air and if turn the switch on dash on red with ac off I have cold outside air. I know i probably have leak in the ac system somewhere ( already ordered the uv light with glasses to find it) but what is going on with the heat? Thank you for help and sorry for my English.