Fridge question: My Freezers,working well,but my fridge....?

First of all if nothing has ever been done to your frig. the first thing you need to do is remove the bottom grill from the front and clean the condenser coils. I bet if you check it will be totally packed with dust and lint. Take a shop vac or a plain toilet brush and clean the coils thoroughly so you can see all the way to the back.