We used Solar Guys to install an exhaust fan in the garage ceiling controlled by a thermostat This fan was designed with a fire sensor that would close the damper if necessary. The thermostat was set to 95 on, 90 off. We also added 4 vents in the insulated garage door. Except for moving air, it did nothing to lower the temperature in the garage. We had an East orientation.
A neighbor with a North orientation consistently has garage temps that are no warmer than the outside temp. They have radiant barrier insulation in the attic and an insulated garage door. So it may be a combination of both orientation and insulation. IMHO skip the ceiling exhaust fan.
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