My boat came with a fridge that went into hyperdrive then burned out the P C board in it. I replaced it with another brand, and their customer guy said they added a small Dc fan on the fridge's rear 9coils) to improve the unit. This one, a NORCOLD as been in 22 years now with out a problem. If the fridge is powered either AC or DC fan runs. It says 1120 Ma current at 12 V on the fan, as it looks like one used in computers. I would suggest adding one if it don't have one. Buy one with ball bearings. Quieter and lasts a lot longer.