Air in the radiator lines or...

Hello ALL! James here. Guess what? My car dont like the cold, below 20 that is. At any rate I purchaced the engine warmer you guys at MS sell and it was easy to install with the helpful instructions.... though I do have one question about the 'air in the radiator lines'. Does there have to be constant fluid throught the entire system, including the top hose? Even when off? How can I be sure. I have drove the car for a few days and I have not plugged in the heater yet- we have had a mild winter so far, but I just want to make sure that all is well before I do. One other question is...will the engine operating tempeture vary depending on weather? For instance my car runs at 75-82 C when its 40 F or below ... is this normal? Thanks James the WVO dream pursuant

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