1984 Mercury Topaz cooling fan will not stop running

1984 Mercury Topaz. The cooling fan will not stop running. I already replaced the temperature sensor but it did not fix the problem. I have read that for cars with air conditioning there is a fan controller, but I do not know where to find it or what it looks like. Another problem is the blower fan; it will not blow any air. I already tested the fan, it runs in another car so it works, and I do not know what else can be wrong with it because the fuses are fine, and all the connections are well plugged.