Make sure the cooling fan behind the fridge located between the upper and lower vent is working, you'll hear a high pitch whine if so. It doesn't hurt to add a fan or two up in there. They're just 12 volt computer fans. With my recent 100 plus degree days, I've removed the lower vent and placed a floor fan blowing air into that vent similar to the picture shown except I have my fan on a plastic milk carton box. You want as much air movement as possible. Also the flapper that seals the doors on the Norcold fridges are notorious for leaking air. There is an adjustment on the door hinge that fixes this. Just Google it for more info. It involves placing a washer on the bottom hinge.
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