Hi Mike, that is a good question, we can think the Factory A/C was available from the beginning, I mean from Oct 1969 for Fairlady Z series. Because, the very first catalog listed the A/C as an option for S30 (Fairlady-ZL ) , and the Service Shuho ( service bulletins)which Alan posted is dated at Nov 1969 .
Mike , I was wondering too , the book dated July 1970 . Why ?
Then I red the Forward again . It says “ the car S30-C which is designated for this A/C has been installed the system in the assembly line . However, cars other than S30-C are going to have the A/C as an option, then installation must be done at dealerships. So please refer this book for your installation “ .
This leads to me a picture in my mind like this , when S30 cars were introduced A/C system was not so popular. But gradually people tended to have it for their S30 ( Fairlady ZL ) after purchased . Even some people would have wanted on their S30S ( Fairlady Z ) or PS30( Z432) which were regarded as cars they “ can’t chose A/C “ on the catalog .
To accommodate those cases , Nissan issued this book making the installation easier for dealership mechanics. I think like this , what do you think of it?
About S30-C , I studied a little bit .
In the Service Shuho , we see Nissan gave a specific variation code for the car equipped the A/C on S30 , that is S30C ( C stands for air-Con I think) . Type code ,classification code , these are the matter of Japan Motor and transportation ministry. And those are interpreted into specific numbers and they are indicated on the registration/certification paper . A variation code is Nissan in-house code thus not shown on the paper . Having the A/C in S30 had nothing to do with Type code and classification code , so no need to declare for amendments of the paper. ( if you swapped Engine, or changed length/ width etc that is going to be a subject of the amendments )
About S30-00002 , I don’t know when the car had the A/C, I am very curious about it too .
Kats