FREezer works fine,frig will not go less than 40 degrees and unit never cuts off

The problem is the freezer drain is plugged up. when the fridge goes into defrost,the water that is suppose to drain out has no where to go. so it refreezes . that ice has plugged up the blend air vents between the freezer & the fridge.
1st put your food in a cooler. Unplug the refridge.
(you may want to take pictures as you go.for the reassembling)
open up the freezer, remove the rear panel, & the bottom panel (if possible)
you will see the coils, underneith the coils you will see an metal tray. it will probly have ice on it.
with a blow dryer, heat the ice till you see the drain . now that drain has to be cleaned out.
that drain runs down to the bottom of refridge into a drain pan. with a wet vac , attach it to the drain tube, until you fell suction in the freezer. small amounts of hot water does help.
( it usually gets plugged up from bugs)

next , open the fridge ,on the ceiling of the fridge.there will be a plastic cover (most models) remove the cover carefully. usually there are 2 passiges from the freezer to the fridge. that is where the cold air drops into the fridge. there will probally be ice in these passages, which has to be removed.(be careful with the stirofoam)

once you have cleaned out all the ice ,reinstall all those pieces.
plug back in the refridge.It will tak a day for it to get cold again.( hint get 2 bags of ice to help speed up the cooling down process)