You could probably take the side closest to the sagging down and
spray the ceiling with adhesive and then press it back up. That would
probably be the cheapest bet. An auto detailing shop might also be able
to do it for you if you don't feel comfortable doing it yourself.
The headliners in these cars all come down sooner or later. The
headliner in my 1979 Sedan deVille is finally starting to come loose and
I'm dreading doing a replacement because my Burnished Gold interior
color will likely be challenging to match correctly. The headliner
fabric comes loose because the fabric is glued to thin foam. The foam
disintegrates over time and the fabric comes loose as a result. Gluing
the existing headliner fabric back to the old broken down foam
underneath will never correct the problem. The only way to fix it is to
remove the old headliner and replace with a new one.
Check here this procedure guide (as reference):
tutorials/cadillac-fleetwoodHope helps.
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