The fridge and freezer would be much warmer if the defrost coil were turned on while the compressor was running, it would overpower the compressor because they are usually a heater that uses around 500 watts. A defrost timer shuts off the compressor when it runs a defrost cycle. My fridge has a 23 minute defrost interval. Is this a side-by-side, you'll know it's frosted up if you look through the vents on the bottom of the freezer, if the coils are visible you should see if they are coated in ice or not. You normally wouldn't see the frost inside the area where you put your food.
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