If the evaporator coils behind the back panel of the freezer
are icing up because of auto defrost failure that will stop the circulation of
cold air and eventually affect the freezer too.
The fridge gets its cold air from the freezer through a vent
between the freezer and fridge.The fan in the freezer blows air through
it.
There is a flap you adjust with the
fridge temp. control. Make sure it's opening and closing when you adjust the
fridge temp ..
check defrost timer, defrost heater, defrost thermostat. In
most newer models the timer has been replaced by an electronic control board.
If the heater and thermostat are ok it’ll be the control.
http://www.acmehowto.com/howto/appliance/refrigerator/refrigerator.php
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