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Just for more info on it, with an oil cooler (air cooler) and a koyo radiator and at around 30F if my car is already warm up it will sit at around 700-800. But if I just let it iddle at that temperature after driving it a bit, the oil and coolant cool down quick enough to make the engine bump the iddle to 1100 rpms and it stays there until I drive it, no matter how long I let it idle, it is not enough to heat up the car. I doubt your problem is the same (unless you also have a bigger rad and an oil cooler) but you do have an automatic car so maybe it takes longer to warm up? In anyway, it is totally related to outside temperature and not abnormal at all.
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