Q: Q: Engine Overheating

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At lower speeds, my car runs really hot. However, at high speeds, it gets back into a normal range. I just had the coolant flushed about 5k miles ago, but had to add coolant recently. Not sure if it water pump is going out or if there is a leak in my coolant.

My car has 151000 miles.
My car has an automatic transmission.

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