Air Conditioner

I just replaced head, timing belt, water pump, oil, oil filter, and coolant. I did not unhook or take off any air conditioner components other than unplugged air conditioner compressor. After putting back together and starting (driving) car the air conditioner works intermittently. When accelerating or driving steady air conditioner gets real warm air. When you let off the gas it gets very cold, when in park it runs cold for a while then warm for a while. Sometimes it will start to get cold again. In drive when stopped it gets warm and stays warm. I checked and added Freon per instructions on kit, still same as before. Also engine temperature is running normal and coolant level is where its supposed to be.