my 91 rad fan stopped working so i replaced it but still nothing....so I had to wire it up to a switch inside so when the temperature goes up, i just turn the switch up.......does anyone now where the fan temperature sensor is so I can replace it? I replaced the two sensors by the thermosat housing on the 3.0, but still nothing..please help............

 

Check the fan relay switch. Could be on driver fender or on firewall passenger side. Usually a series of small black boxes in a row...but you need to know which is for fan.
If you do not have a manual try asking local parts store if they can pin point location. Mine is on firewall.... (1992 3.3)
You seem pretty confident about electrical...hooking up switch......if no power at fan
connection.....is there power at sensor....or power at fan relay terminal. Again local parts store ( I use Advanced very helpfull ) can advise on part locations.
I have an article from Popular Mechanic I can e to you

 

ok that will be great...I will look into that...thanks