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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.
could also be the foam seal on the blend door is deteriorated not creating a good seal anymore allowing fresh cool air to mix thus lowering heat output
could also be the foam seal on the blend door is deteriorated not creating a good seal anymore allowing fresh cool air to mix thus lowering heat output
Thats exactly what is with mine, I replaced the core and i guess didnt do a good enough job sealing it back up as I can feel cold air leaking from under the glove box, It still heats but not as well as it could, Oh well im not taking that bitch apart again lol.