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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
I would set it at 190-200. If you have a 180* thermostat.
You don't want it to come on at normal operating temp, i.e. cruising down the freeway with the fan on.