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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 highly doubt the blower motor being on was making the temperature go up. sounds like the thermostat is stuck, and the blower motor will only help with cooling if there is flow.