Orifice tubes

[lil_Blue_Ford]

The Brown one, with smaller hole(orifice) doesn't make it colder persay, its smaller to release compressed(high side) "freon" slower into the low side so it can expand more which does make it colder when temps outside are higher than 90deg or so

If you overfill then low side doesn't go as low so compressed "freon" can't expand as fast so less cooling
If its under-filled then it will get colder but can also freeze moisture in the incoming outside air and block the evaporator, no air flow thru it
Evaporator should be 35degF at the coldest, 40degF is normal, dropping below 32degF is when you have a problem, it becomes a "freezer" not a "refrigerator" lol

Its a balancing act betwen high side and low side pressures

I have also discovered that the pressures can change between initial fill and after it’s been used awhile. I heard that it’s due to the composition of the Freon and takes some cycling to settle. Part of my problem is I don’t use AC a lot, but that Ranger cab gets way more uncomfortable than the F-150 because of the lack of the wing vent windows.