Replacing the grill is usually easier if you open the refrigerator door so you can see the slots the grill fits into. If you have coils under your refrigerator, you must not forget to clean off the fan grill as well. This grill can be found behind the refrigerator. Slide the refrigerator out from the wall until you can squeeze in there with a vacuum cleaner attachment. Be careful not to scratch the floor under the refrigerator.
Older refrigerators have coils in the back.
Slide the refrigerator carefully out from the wall until you can reach the coils. Clean them completely with the vacuum cleaner's dusting attachment, then slide the refrigerator back into place. Be careful when cleaning or moving the refrigerator not to dent or damage them.