An update...
Installed a new temp sensor and resistor last night. The fan kicks in with the A/C on at about 80 degrees. After driving with the A/C on, the car got warmer, and the fan speed went from high to low.
So, I guess I hooked up a wire backward. Which wires would do this? The resistor, the temp switch, or the wires coming off the drier? After all this I know I need a fan, so I'll install this next week.
Thanks for all your help!

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R Talley
88 BMW E32 735i (make it go away)
95 Volvo 960 "Inga" (valve problems)
95 Nissan Maxima (the indestructible)
89 Ford Ranger XLT (ugliest truck in the South)