A/C & Radiator fan not working

Recently my 1996 SC1 began to get hot in heavy traffic. Normally the
radiator fan will come on when the A/C is on or if the temp gauge reaches
1/2 way. In this case neither happened. In testing the components both the
fan and the A/C compressor work when 12v is applied directly to them. The
car has a single coolant temp sensor so the temp gauge would not work if the
coolant tem sensor was bad. No trouble codes from the computer and the fuses
and relays are all good. Any ideas would be appreciated.

mike