My ‘86 GT came without rear window defrost. During restoration, I went through several replacement hatches, and I think they all had the rear defrost. Mine has it now!On the Marti report for both my 90GT and my son's 89GT they both list "Electric Rear Window Defroster" under the features (options) section. I have seen the odd hatch for sale with no defroster grid in it. I would expect the glass to be stamped with a Carlite stamp as well.
I would expect that cars built for the southern areas of the country would not have the rear window defroster option.
Bill

