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My iPhone 6 shows up a cooling before use message at normal temperature. At the beginning this can be solve by putting the iPhone into the fridge for short time. It is totally not work after this several times. I sent the iPhone to some repair stations to fix it but it still not work. What is the problem of my iPhone?

Does the front, back camera and flashlight work fine or is one or more of them not working? If that message appears when the phone is not noticeably hot it means that either the thermistor for rear camera (the component responsible for measuring the temperature for rear camera flashlight) has gone bad or a component near that thermistor is causing a short and is heating up that specific spot on the logic board a lot causing that high temperature warning to occur. A reputable phone repair shop that does micro-soldering / board repairs that knows how to diagnose this specific issue should be able to fix it for you.

Es un problema que lo tienen que hacer profesionales en un laboratorio con el equipamiento necesario , es necesario cambiar el modulo wifi del terminal o en su defecto rasparle la capa superficial hasta encontrar dos resistencias dentro del modulo y quitarlas por completo , pero si tiene reparacion . Te dejo el link donde se puede ver el video : https://www.youtube.com/watch?v=K2UAopFO