Early A A/C how well does it work

My 66 has factory a/c, it only has center outlets. So only the center of the interior get the major cooling.

On a long drive it will get really cold through out the interior except on the sunny side with the sun beating down on you through the side glass.

I'm going to add outboard outlets to the system as high as possible on the face of the dash. I may block off one of the center outlets to keep the air flow up.

The system is amazing in that I've only had to add a half pound of R-12 to it since 1966.

That said, it will probably all leak out now just for spite.

After all its now 46 years old and has 122,000 miles on it.