My two-cents worth: Presuming that the 32°F superheat figure is accurate, and also allowing for the now re-adjusted TXV, the system is undercharged. Simplistic, I know, but that's the way it seems to me.GottaBeCold88 wrote: ↑Wed Jul 27, 2022 1:09 pm According to my calculations, I'm at 20* Subcool, at 32* Superheat.
(By the way, you'll see two numbers in the low pipe temp column, as I was asked to measure both pipes coming out of the evap. They were very close to each other, but the #10 was 1-2 degrees cooler than the smaller one)
So, if turning the TXV screw out 1 turn lowered my superheat from 38 to 32, that's 6 degrees. To get down to around 10, I need to lower superheat by 22 more degrees. If one turn got me 6 degrees, I need to turn it out another 3.66 turns, making 4.66 turns total from how I received the TXV.
Does my logic check out? And, will the screw even turn out that far without falling out of the housing?
Recall that the stock system takes 44 ounces of R-12 without rear A/C. Your custom set-up has hoses and lines that are considerably longer than stock, making the original 44-oz. specification seem like it's on the low side. You're at 37 ounces now, I think you mentioned.
And about the superheat adjustment screw: I would hesitate to turn it out that far. I never tried, but if the screw loses contact with the spring, the screw will become loose. It might even fall out, as you suggest, depending on the length of the female threads. But I don't know that for certain.