Also, story time. One of my good buddies just picked up an 83 Pickup, short bed SR5, that at one point, they pulled the factory air conditioning. So we were looking at my non functioning factory installed a/c, to figure out what all he needs. As we were sitting there looking at it, I mentioned how cool it would be to get mine going. Pun intended. But I guessed it hasn't been used in over a decade, judging by the wildly cracked, leather belt on the compressor, and the missing knob to turn the a/c on. Just farting around with it, I reached in and pushed the schrader valve, and heard a slight hiss. I couldn't believe it! It was actually holding pressure!
Convinced it was going to work, I brought it to one of the techs at the Toyota dealership I work at, and we threw the gauges on it. After more than a decade of not working, it was holding 10 PSI! I know that's not much, but hey! That's something. We assumed seals were shot, and a few other components, so we replaced all of the o-rings, the drive belt, the dryer, and the expansion valve. Threw a charge on it, compressor kicked on, and it's holding pressure! I kid you not, it's blowing 30 DEGREES. Man the 22R hates spinning that compressor.

But it blows SOOO cold. One more trick up George's 37 year old sleeve.
**Side note, if anyone comes across one of those factory A/C knobs, that goes behind the fan speed knob, please let me know! Cannot find one to save my life.