Norcold Loses Cooling While Driving in Systems and Appliances Posted May 14, 2013 · Report reply Our Norcold 1201 LRIM refrigerator loses about 1 Degree per hour when we are driving. I've experienced this when on propane, the generator, and the inverter. It typically cools down over night, but then the same thing happens the next day on the road. I did raise the vent cover about 1" to help cool the unit because we were having trouble getting it down to temperature, but I did that long before I started experiencing this current problem. Any suggestions?