92 MR2 Overheating!

Hello friends, i have an mr2 that was running fine and then i :screwy: decided to have the ac fixed, after a month or so the car has been overheating really bad, i took it to the shop and they fixed the thermostat, gasket and pressure cap, anyways the car is still doing the same thing, i dont' want to go back to that shop anymore, does anyone know what is wrong with it or what i can do, or just take it back to the shop?, thanx in advance

when does it overheat? how?

top of my head without you clarifying. maybe they plugged the aircon fan on the radiator in backwards and its blowing against airflow over the radiator? or maybe they didn't plug it in....