I've got this old school freezer that has the refrigerant charge amount crossed out and written in by hand. There's a service port on high side right when the liquid line enters capillary tube which looks like it was added on past production.
It's an R-12 Kenmore "5" upright freezer .
Inside, there are three evaporator shelves and liquid refrigerant enters from top, then goes down.
It cools, but the third evaporator coil (very bottom) is not building up any frost line at all. What does this mean?
I've never seen a household freezer with a service port. This one has a charge port, but it's only on the high side on liquid line right before it goes to capillary. Is this meant to be used for evacuating as well as charging by weight using injector style (like the oil injector type) refrigerant charge tool?
Since household freezers are disposable commodities these days, I guess techs don't go out and fix them anymore.