My air condition stopped working, first I notice what looked like smoke blowing and it was reala cold. Later it stopped blowing on air condition or heat, nothing would come out. air sometimes come on

I have no answer , However my air condition went out and it went from a condenser to an evaporator before it was fixed. Which if I had know before hand what it was going to cost time they were done I think I would have looked for another car. Over 2500 dollars so far and now the emergency light is on and they told me I could drive it , Now it stays on all the time. so have returned to dealer and they tell me it needs a 350 dollar part which cools motor . They installed it and still light is on all the time Before I took it down there it was running fine . I am concerned they have messed up something and the car is going to have more repairs in it than it is worth.. I have done business with this dealer for almost 18 years but I am worried the mechanic does not know what he is doing and has ruined something.. Has anyone else had a similar problem..Our first Priius 2002 is still running with 250,000 miles our daughter in law has it.. WOULD APPRECIATE ANY ANSWER. ACCH