Q: My car is overheating. What's wrong with it?

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My car started leaking from the coolant reservoir. I took it to a shop and they said I needed to replace the coolant reservoir...so I did. It still leaks. I put in a new thermostat but it still leaks. It's to the point where it no longer comes on. What is wrong with my car. It won't hold coolant. It smokes from under the hood and tailpipe.

My car has 159000 miles.
My car has an automatic transmission.

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