Sounds normal, if your getting more heat in the cab now, your temp gauge will be lower because your pulling more heat from the engine and into the cab. When at idle less rpm's and this cold weather, along with the heat going into the cab, your temp gauge should be really low like you mentioned. Also, when you see it hit normal operating temp, is it right after turning off the heat, or turning it down? Because either of those would increase engine temp.
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