So pretty much my Honda civic from 05 has been having cooling issues and I've done some work on the vehicle in attempts to fix the issue; I've replaced the entire engine, replaced both the radiator and fans, leak tested the system and have gone through 3 thermostats none of which have stuck.
Though every time right before the engine begins to overheat the overflow reservoir coolant seems to have lightly spray out, I have never witnessed this actually happen but when I do pop the hood after the gauge seems higher than usual there is drops of coolant on the fan and the engine. There also seems to be the smell of coolant before the overheating occurs in some occasions, my current belief is the Nevada heat is the cause of the issue and the radiator and fans aren't enough and does not give my engine enough coolant; In result of this belief I cut the spring of the thermostat and had it set to an open position thus to increase flow of coolant but even with that the engine continued to overheat.
I'm legitimately stumped and various mechanics have also been confused on the situation, I'm considering taking the car to an Official Honda service center but before I do so I'm trying to get some help with this before having to pay an arm and a leg for service costs.
additionally, the fans still spin at the correct intervals, recently air tested the cooling system, and all hoses don't seem to be damaged in anyway as for the overflow tank the water seems to be all the way at the top and boiling during these overheating issues.