I have a 2002 that has been overheating since I.

I have a 2002 that has been overheating since I bought it. I took it to the dealership mechanic who said it was the thermostat. About a week later it started again. Took it back and they told me the car was fine even though it was struggling to transition between gears. Continued this take it in, looks great routine for a solid 9 months so I thought I was nuts. Shortly after having them inspect it before driving it out of state the transmission went. Towed it back and took it to another mechanic to rebuild the transmission. Drove fine for a little bit after that but began overheating again. Took it back in and they found the radiator was cracked. Replaced the radiator, ran good for a short while and began overheating. Bled the hoses, recommended I use better grade gas then finally admitted they had no clue what was wrong with it. Took it to 4 more mechanics who simply told me the hoses just needed bled and one more who changed out the thermostat again. Still overheating to this day. Has had timing belt, water pump, transmission, radiator and thermostats replaced. Pressure checked with good results, no diagnostic codes indicating issues. I'm completely lost! Losing coolant though its not apparent where, head gaskets fine, no coolant in the engine. It's apparent it overheats now everytime I tap the brakes.