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the thermistor on these trucks on some is used to set the temp in the cabin on the adjustable models - the others are for the freeze up issue when there is no adjustment. I have had both types - my 85 Royal would freeze you out even in 100 degree weather, but it is on or off.
could be. I replaced mine and it just doesn't get cold enough for me. I guess that the electronic thermo controller may have drifted internally but there aren't any trimpots inside to adjust so you would have to find either a resistor that drifted in value or replace one with a different value.