Some late 60's 911's had it. Maybe older. It was a rare special order option. Power brakes were 77. Power steering '89 carrera-4 and all since. Except the RS America. Seems to me that all SC's and newer had A/C. I believe from then on you had to delete option it off if you didn't want it. I could be wrong but I've yet to see one without it after about '78.
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