Okay My bad, I assumed it was as most are. And because he has now said it doesnt have a compressor hump then Im guessing his is thermo electric.
Not terrible advice as the heat is drawn away from the rear not the sides, note I said cover the front and sides with a blanket not the rear.
What can reset to a higher temperature? The STC1000? I always run my fridge at the highest temp seting and use the stc1000 to control the temp and as far as I know thats what everyone does. if the STC1000 is set at 18C there is no way the fridge is going to get higher than that unless the probe or stc1000 is faulty.