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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.
and if you have to go through ordering one, for a quick check. take the cap off and make sure the coolant is to the top....then go get a thermometer and stick it in. shove it through a peice of cardboard so it doesnt fall in....then let the car warm up. n watch that the t-stat opens...then watch the thermometer and see what it goes up to......then when you get the gauge in the cap. go take it for a ride and wait to the stocker get up to 240 or whatever it was goin up to....pull over..let it run and check it..now you know what its heating up to.. EASY ENOUGH. DONE.
its doing the same thing i called rancho auto parts and asked them if it could be my temp sending unit they said they would have to look at it. and that part is only 10$ so yea if its not that then i dont know maybe my gauge is broken.