The sensor for the PCM is a two wire one.
The one for the gauge is one wire.
That said, it could be a relay issue, the relays do fail.
Do the low speed fans come on when the A/C is turned on?
96 T/A, Black/Graphite Leather, T-Tops, 6 speed, 10 speaker Delco/Bose "Monsoon"
Original owner, 206k miles and counting.
Total engine rebuild at 187,020 miles. AIR delete, bored .030 over.
Comp cams Xtreme Energy LT1 266HR-14 street cam and springs.
Custom leather interior at 190k miles. Total repaint 193k Miles