Assuming that your model number is 253.68893013 (ends in 13 and not 31), then your Kenmore top-freezer refrigerator has capacity of 18 cu ft. If that isn't your model number, please double check your model number and ask a new question as the one you provided is not valid. Here are the dimensions:
Depth w/out Handle (In.): 30.125
Depth w/ Handle (in.): 32.875
Height to Top of Case (in.): 65.875
Height to Top of Hinge (in.): 66.56
Width (in): 29.625
You can find parts, diagrams, and your owner's manual on www.SearsPartsDirect.com
, just enter your full model number. You can call Sears Home Services at 1-800-4-MY-HOME for repair.
If you need a new refrigerator:
The dimensions of new Kenmore 18 cu ft models are similar. Here are all current 18 cu ft Kenmore models: www.sears.com/search=Kenmore%2018%20cu%20ft?searsTab=true&excludeMarketplace=true
All top-freezer refrigerators: www.sears.com/appliances-refrigerators-top-freezer-refrigerators/b-1020313?searsTab=true&excludeMarketplace=true
In the left hand column of search results, you can select Yes or No for ice makers so that you'll only see search results for models with or without an ice maker depending on what you are looking for. If you want an ice maker, it's much cheaper to buy a Kenmore model with the ice maker already installed.
Hope this helps!