what part turns cooling fan on and off? on 1995 Mitsubishi Eclipse

the cooling fan does not turn on ever,causing car to start overheating.. temp gauge gets warm/hot

Asked by for the 1995 Mitsubishi Eclipse
2 answers
ck fuses and relays. does the aux cooling fan work with a/c on? do fans work if direct pwr is run to fan motor?
May want to replace coolant temp sensor too.