My engel 43qt.wont freeze any more. It comes on when using the 110v plug but won't even get cold. Does it require refrigerant replacement like a car? also when pluged directly into my 12v lighter socket thecompressor won't even come on. Plug fuse is good. If i plug the 110v into and inverter and then plu the inverter into my lighter the compressor comes on but just won't get cold. Can you help?g
Refrigerators - Engel - MT45F 43 Quart Portable Refrigerator & Freezer