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mystery solved

I'm about finished with Miss Fuller's car.

I had a bit of a head scratcher with it.

It turns out I was sold the wrong thermostat. The part stores specify 190*F as the correct opening temperature for the T'stat in this car.

I looked up the Mazda spec, found the correct 180*F thermostat, and installed it.

Lo and behold the radiator cooling fan now cycles normally.

All that is left is to drive it.