fan does not turn on when sensor is plugged up

[dastang2]

hello, my 95 has been having some issues for a long time now. i already replaced the sensor. when it is plugged into the sensor on the intake, the car likes to get hot and the fan won't turn on for a good while and when it does it only stays on for about 10 seconds. when i keep the sensor unplugged, the fan stays on constantly while the car is running and that is how i run it. i am guessing the little module looking thing that plugs up to the fan and the harness has some relays in it or something and that is the problem. anybody know what this is and the cost for the new part