White smoke from exhaust

Then the air conditioner will not work, when you try to switch it over. Things I have done: Put car up in front and back to try to get air bubbles out. Still has bubbles. Took water run through the heater core, run through fine. The car is full of antifreeze, it does use some but none on the ground under the car. Does have white smoke from exhaust. When the heater works it does come out at what ever I have it set on. The fan works fine. Please help. Thank you.