Water pooling below the crisper drawers at bottom of the fridge. Kenmore model #363.79262991

You need to get a replacement gasket for the make and model of the refrigerator, http://www.fixya.com/support/12355008-water_in_bottom_left_crisper_drawer

Check the drain channel at the rear of the fridge just above the crisper drawers and blow through the drain hole with a drinking straw to clear it.

The drain is clogged that goes down to the bottom of the fridge during defrost. What's the model number?

Yes it is located in the refrigerator on the bottom in the back. I assume you know how to clear it, Hot water plus towel to soak up excess water should take several tries of very hot water until it clears. Good luck

The defrost drain hole is plugged. you must open that and then the water from defrosting will not pool up below the crispers in the bottom of the frig. Generic ice box Manual and more Here

If you need further help, reach me via phone at https://www.6ya.com/expert/dan_73bbd84fe1d95b61

Make sure nothing fell below your crisper, deli drawer section. There are some air return vents below them and if they get partially obstructed would allow cold air to pool in the bottom of the fridge.
Make sure your freezer control did not get turned up too high.
Also you may want to check with the manufacturer as they did have some issues with some of the bottom mount models exhibiting this problem and they developed a repair kit for them.

the defrost drain in the freezer is clogged with ice.
empty the food from the freezer, and put through a defrost. you might have to help the fridge defrost with a hair dryer. you may also have to remove the rear panel (inside the freezer) or pending on the model to bottom panel of the freezer.. (usually held in by 1/4" hex screws.)
melt all the ice, and be sure that the drain is clear, and it should work.

If you have a side by side model you need to look at the refrigerator compartment wall on the left of the bottom drawer and move the slide control to the warmer/fruit/vegitable setting instead of the meat setting.
I hope this helped. Please rate my help or ask for more help please. supertechks

I could not locate any white tank where the water comes to/from. There is only a clear plastic water line behind the crisper drawers, that is coiled up and goes up to the water filter at the top on one end, and down through the bottom of the fridge on the other. The coiled line seemed like perhaps it was frozen, so I took a hair dryer to that but it didn't help. I also tried removing the cardboard cover in the bottom back of the fridge, to see if perhaps the white tank was back there, but it was only
more line, which goes towards the front of the fridge, where it goes up into the corner of the door.