Hi
I've recieved 2 small coolers that doesn't cool
both same brand both brand new.

1/6th hp compressors, 134-A, 4.6oz, 2.5 amps on the
sticker inside (but 2.9 amps on their website)
These were shipped from outside the US that is why
the owner didn't want to return it. $$$

So I hook up the manifold nothing... no refrigerant
I see where the access valve is there is a hole where is bends ...so this unit could have never been tested...

fix the hole...blew the capillaire to make sure it was not clogged... replace the filter/drier

Charge to manufacturer specs 4.6oz...not cooling at all...so now I am confused and I am thinking maybe
my weight scale is playing tricks on me... so I weigh my bottle ....charge the unit again to 4.6oz ...then check weight again...seems correct but still no cooling :/

so I continue to fill the unit to about 20F and the unit cools now... reaches 44F which is still not satisfactory

the other cooler has refrigerant in it but doesn't cool
so I charge it to 20F and it ices up... contacted the manufacturer told us to charge to 25F still ices up
charged it to about 30F the cooler reaches 48F but will not go any lower...

anyone have some suggestions to these problems
anyone have some ideas what the superheat/subcooling would need to be for these small appliances I would like to really know what the problem is with these units

ambient temp here is about 82F it is any help...

any help would be apreciated
Thanks