Q: My car overheats and I'm not sure if it's the sensor or it's actually overheating, I also can smell coolant

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My car overheats mainly while I'm idle but will overheat as well if I'm under like 25 mph. I also can smell coolant when it does start to overheat and in not sure what the problem is. I recently had my radiator replaced but that didn't help. I'm not sure if it's my sensor either.

My car has 90825 miles.
My car has an automatic transmission.

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