93 Caravan, Fan will not turn on, runs hot

I have a 93 Dodge Caravan 140K miles 3.3 engine. The Radiator fan stopped working and the van ran hot. I have changed the temperature switch and the sensor both located near the thermostat. I have replaced the fan with a brand new one. And changed the fan relay that I was told was on the passenger side fender above the strut. Still nothing. I hear that there is another switch. Could you tell me where it is and what is it called, or give me some indication on what else can I do

Thanks