Engine Cooling problem
1996 Chrysler Concorde 6 cyl Two Wheel Drive Automatic 154000 miles

I HAVE HAD THE "RFI" MODULE BETWEEN THE FANS REPLACED 3 TIMES AND THAT SEEMED TO WORK BUT OUT OF NO WHERE THE FANS WOULD COME ON WHEN THEY FELT LIKE IT. USUALLY THE FAN COMES ON WHEN THE ENGINE TEMP GUAGE WORKS 1/2 WAY BEFORE THE ENGINE STATS TO OVERHEAT BUT THEY SHOULD COME ON WHEN THE CAR STARTS AS USUAL AND KEEP THE TEMP GUAGE AT 1/4 BUT THEY DON'T ALWAYS DO THIS AND WORK PROPERLY ONLY SOME OF THE TIMES.NOW THAT IT HAS GOTTEN COLDER ,THE FANS COME ON EVEN LESS. IS IT THE "RFI" MODULE AGAIN OR COULD IT BE THE TEMP ENGINE SENSOR OR WHAT? CAN ANYONE HELP?

THANKS

RLEIGH59@HOTMAIL.COM