No, the car does not run the pump, the windmill does, Yes it is a well,...I think they might have tried using the motor on the car, to run a pump, at one time,..but right now it is not working. The owner commented about that though, something like "if only we had a good motor, gas or diesel , we could pump water even when the wind is not blowing" so I got the impression that does not work at this time.
The wind mill stay running all the time, except if there is no wind, mostly to keep a stock tank full , so the cattle have water,..the "over flow", goes to the trees and toward the fields, Pretty efficient really, what water over flows, and runs out into the area where the trees are, then goes back down into the ground, eventually works its way back into the well,..