fridge question

Update, it sat in 80 degree weather for two days straight with having the door opened a few seconds twice, after getting home from work today, it was 60+ degrees in the fridge! I've noticed on the back of it there is a valve where it would seem like you could "charge" it.......the local RV shop tells me you can't get that done ANYWHERE around here.......and they have em rebuilt.........Does ANYONE know if they can be "recharged" with liquid ammonia? Yes, it is level, tho need to put the level in the freezer just to make sure............but pretty sure that's not it....and yes, I do know RV fridge's suck for the most part.......but not that bad.........anyone with any advice on this subject?

Happytrails