I got the fans running. The problem was a corroded and broken plug on the fan. I cut one off a car at the junk yard and spliced it on, and now the fans run. But now something equally strange is going on. When I start the car and let it heat up the fans never turn on, but if I pull the relay and jump the contacts with a wire, the fans turn on. When I plug the relay in again, the fans run continuously until I turn off the engine. When I restart the engine, the fans will not turn on until I jump the contacts again and plug the relay back in.
The other strange symptom is that the temperature gauge never seems to have a range of stone cold to warm. It never gets quite up to halfway on the scale. What is going on? Is this a temperature sensor issue, or the computer?