Hello sir. My Hyundai sonata 2.4 cooling fan does not start real time and engine gauge going up.. I already changed my coolling fan, termostat.. The fan some times start when hit very up but before engine cooling down the fan auto stop. Mecanic suggest me to change computers systems. What should I do.

well, try a new temp sensor for the cooling fan system. if not that, wiring or main computer is bad. good luck

Thank you sir