Welcome to the Forums and the world of Vintage Airstream ownership!
If your coach still has its original air conditioner, it may be worth repairing. Your coach, I believe, was built prior to the discontinuance of the Armstrong Bay Breeze Air Conditioner. Armstrong air conditioners were heavy duty units that utilized industrial quality components and are definitely repairable in the hands of a qualified service technician. I just wish that I had known more about the quality of the Armstrong units before I allowed my original 1964
Bay Breeze to be removed from my coach.