Dometic Americana refrig

#1
We are having problems with the refrigerator freezing everything when the weather is really hot. The dealer said a switch at the top of freezer door was set wrong and supposedly set it correctly. Refrigerator worked for a couple of weeks and started freezing things again as soon as the weather heated up. Manual says temp is preset at factory. Any suggestions. We have a 99 Coachmen Catalina Class A 34' Motor Home.
 
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