if your fridge has exposed (or hidden under a fascia) coils like my 1970s GE Harvest Gold one does
vacuum or otherwise brush out your fridge's coils, it will thank you.
Some of them are designed in such a way that getting to the coils effectively is nearly impossible (lookin at you, old Maytag with the coils all folded up under the bottom of it and no gaps to get a brush or vacuum head into). Getting behind it with an air compressor or electric leaf blower is a decent way of working around that limitation, if a bit messy for the rest of the room. Can set up a shop vac on the other side and that catches most of it though
