John, I'm not sure of the model number of my Norcold, but it has a fan under the compressor that's powered by 20VDC. It's attached to the controller board on the top of the under. I added a second small, very low current 24VDC fan to the top rear aimed at the controller board and 110VAC inverter and haven't had any problems. I did a web search and bought it from a place that appeared to specialize in fans. This eliminated the frost buildup that I was getting in the top of the freezer. Gil --------------------------------- See the all-new, redesigned Yahoo.com. Check it out.