Electric fan thermostat poltergeists

Just completed a valve job on FROG AYE which included a recore on the
radioator and an an electric fan with thermostat.  The thermostat seems to
work backwards: I can adjust it to stay on or to be on when the engine is
cold and shut off when it warms off.  Somehow, this seems to be missing the
point.  Any suggestions?

Hal