Can I hook my radiotr / cooling fans to run all the time turn on off with ignition

If you disconnect the cooling fan temperature switch, the fans should run all the time. If the PCM can't see the switch, it figures it is better to run the fans all the time rather than risk an overheat situation.
Note: There are two temperature sensors - one has one wire connector and is used by the temperature gauge only. You're interested in the other sensor with the two wire connector which I think is in the intake manifold near the thermostat area on the passenger side.