How can I repair my Hotpoint Refrigerator?

Need help to repair my Hotpoint side by side refrigerator/ freezer. The Freezer works great but the refrigerator is not cooling. The things that I have tried are as follows: Unplugged the unit and removed the back vent, Vacuumed around the motor and surrounding area to remove all dust. Replaced vent cover and plugged unit back in. Turned temp control up to above normal settings. Waited at least 30 minutes to see if unit would kick on to cool the refrigerator section. Nothing. Could there be a problem with the temp control module?