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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.
One way you can tell is white smoke coming from your pipes. The exhaust fumes will smell kinda sweet. Change your oil and see if there is coolant in it. Pull out your spark plugs and check them for coolant. You would have a noticable loss of power too.