My machine is a Dickie Narco 348. My compressor is making funny/rattling noise and not getting cold. I checked the fan and it spins free/quiet.

My compressor is a model aea3440axa with a ae231al-725 bill of materials. I am trying to figure out which compressor would work and if I can switch to a R134 compressor? Also if I should swap the whole cooling decks or just compressor.

This is just a personal machine in my shop so the cheaper the better. I have seen some relatively cheap units on eBay, but they aren't my exact model number. Can someone help me out on what I need to make this run again, preferably fairly reasonable?

Thanks.