Where is the thermostat on a Maytag side-by side refrigerator/

SOURCE: I have a Maytag MSD2758GE side by side

sounds like you need to replace the adaptive defrost assembly. and yes, it will effect the performance of the fridge. the part number is 12002104 if the first 2 numbers of your serial # is 22; or 61003990 if the 1st 2 numbers of your serial # is 10; or 61005988 if the 1st 2 numbers of your serial # is 17. here is a breakdown showing the location it is # 13 in the picture. hope this helps.

SOURCE: refrigerator side of a Maytag side by side refrigerator not cold

Hi,
There are a few reasons why the refrigerator part will not cool...here are a couple of tips that will help you to figure out why the refrigerantor is not cooling...

Refrigerator not Cooling or Fridge not Cooling
http://www.fixya.com/support/r3662945-refrigerator_not_cooling_or_fridge_not

How to Defrost Refrigerator Defrost Timer Problem
http://www.fixya.com/support/r3771673-defrost_refrigerator_defrost_timer

heatman101

SOURCE: How to test maytag refrigerator defrost thermostat

on your model the thermostat comes with a new heater
http://www.repairclinic.com/PartDetail/Defrost-Heater-Assembly/61006116/1021756
you have to read the t-stat when it's cold,unplug the harness,stick one end into the harness and stick the tip of the other probe into the other wire of the t-stat,or seeing that you have to replace the heater and t-stat anyway cut the two wires going to the t-stat,wire nut them together,manually turn the timer knob to put it into defrost and if the heater comes on you know the t-stat is bad.you can leave the heater on and get a hair dryer,melt out all the ice and then disconnect the t-stat wires and tape them or wirenut them,this way your machine will run for 10 to 12 days before it freezes up again giving you time to order your parts and you won't loose any food.when you get new parts melt out any ice again and change heater and t-stat.most likely the t-stat is bad,common problem.