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Turn Signals, Convertible Top, and Interior A/C fan quit working intermittantly.
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.
as he said I would suspect the switch coule possibly be a problem.
now turn signal problems are often because of a dirty multi-function switch/hazzard switch. If you have issues with them try pushing the hazzard switch 8-10 times to clean it and it will fix them.