1993 Geo Prizm Is there something wrong w/ my radiator fans

When I am driving on interstate or inner city roads, my a/c is cold and the engine temperature is normal. However, ONLY during the hottest part of the day 12-1, when I am sittnig idle, such as in a drive-thru line, my a/c will feel warm or more like less cold than usual and the engine temperature spikes up to HOT. As soon as I start driving, the engine temperature goes back to normal. While it was hot one day I parked and opened the hood. The two large fans on both sides of the radiator were not spinning. I turned on the a/c and they still were not spinning. Can anyone tell me what is wrong? And what I could do to find out or fix it?