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Good morning, this is a common issue on these refrigerators. the temperature sensors are the problem, appliancepartsimages.com/dbImages/00002844/00855829.jpg" alt=""/>these sense the temps and open the damper to let more cold air in as needed. its part # XXXXX on this diagram its located behind this in the refrigerator section. side wall. this is called a thermistor, you can order one @ http://www.repairclinic.com/PartDetail/Thermistor/WR55X10025/914093?modelNumber=PFSS2MIXASS?RCAID=1000065 thanks , Bryan
yes the grill just pops off, and yes you can change this yourself its just two wires, you will need wire splices though. they sell them at lowes, get small ones. the wires are small. I hope this helps, the only thing I ask of you is to please rate me with one of the top 3 ratings. If there is anything else I can help you with today just let me know. You can continue asking questions for as long as you like even after you rate me. Click the continue conversation link if you would like to continue this conversation. If you are done rather than rating me with 1 or 2 smiley faces please use the (continue conversation) link and tell me what else I can do or what else you would like to know so that I can get you that information so I can improve my customer satisfaction rating.
thanks , Bryan