I have a Kenmore side by side that feels the drain pan up and then leaks on the floor.

You need to clean it. Unplug the unit and remove the cover to the freezer coils. At the bottom of the coils there is a drain pan which gets stopped up with food and other things like dirt, meat juice, etc. Wash it out well with Windex and a water hose nozzle to unstop it. Be careful not to bend any coils or “Freon” (refrigerant) lines. Then remove the back and spray down coils and fan blades with soap and wash them off with water hose nozzle. It does not take much water, but it's the only way to clean coils and get grease and dirt off them so that they transfer heat well again. Just vacuuming off does not work nearly as well and you have to clean the fan because just a 1/16" of dirt on edges of blades kills 30% of airflow. Pull out drain pan and clean with bleach and soap if it comes out, or clean it and vacuum out with wet-vac. It's very important to keep the coils clean or the dirt will cause the compressor to burn up.
Manuals: https://dl.dropboxusercontent.com/u/8010163/Whirlpool-Kenmore%20Refrigerators.zip
https://dl.dropboxusercontent.com/u/8010163/Whirlpool%20Side%20x%20Side%20Refrigerators%20and% 20Freezers%20Service%20Manual.pdf
https://dl.dropboxusercontent.com/u/8010163/Whirlpool%20Refrigerator%20R-95%20WP%202001%20K%20Model%20Counter%20Depth%20SxS %20Refrigerator%20with%20Variable%20Capacity%20Com pressor%20Service%20Manual.pdf
https://dl.dropboxusercontent.com/u/8010163/Whirlpool%20Refrigerator%20KAR-12%20KA%202001%20K%20Model%20Counter%20Depth%20SxS %20Refrigerator%20with%20Variable%20Capacity%20Com pressor%20Service%20Manual.pdf
https://dl.dropboxusercontent.com/u/8010163/Whirlpool%20Refrigerator%20KAR-10%20KA%20Side%20x%20Side%20Electronic%20Control%2 0Service%20Manual.pdf
https://dl.dropboxusercontent.com/u/8010163/Whirlpool%20Refrigerator%20Defrost%20Controls%20Se rvice%20Manual.pdf
https://dl.dropboxusercontent.com/u/8010163/Whirlpool%20KAR-15%20Built-In%20Side%20xSide%20M-LineService%20Manual.pdf