I don’t have a user’s manual for my fridge and can’t find one online. I’ve read many times that it’s good to periodically vacuum/dust the coils of one’s refrigerator, but have no idea where they are.
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They ( Item 9 in Section 1) are at the back bottom of the unit, there is usually a cardboard cover.
Be sure to also clean the fan blades.
The way I clean mine is to remove the front kick plate and the rear cover and then roll the unit to an open door. I then use a compressor to blow the dust out from the back, most of it goes outside. I have been told that a leaf blower also works well. This may not be possible due to your kitchen layout or flooring type etc.
They can be cleaned with a long brush and vacuum but it is a pain.