Hello Scotty, i got an automatic Infinity Ex 35 from 2008 AWD 136 000 km , after driving for few weeks, the engine overheated and head gasket was blown so i changed the engine, but now after i changed it when i was driving all of a sudden, the car overheated again but luckily enough i was able to stop immediately this time, took it back to the mechanic, i changed the water pump already, now i changed the radiator cap . A few days after it overheat again. This time the mechanic cleanned the radiator, it was clugged with debris but now the temperature gauge is always moving in between the cold lines, sometimes even a bit above, but I’m always afraid that it might overheat again cuz its not a stabile temperature.( like i had on my previews car) The mechanic told me the car has no problem now......(like always) I must say i live in a desert country with high temperatures . What do you think i can do to be sure that it wont overheat again?( i checked with other mechanics they said car has no problem now as well but im afraid the problem would eventually come back)  To he honest im thinking to sell it or exchange it with a honda accord coupe 2008-2012. What do you think?