Q: Coolant warning

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I started my car and the "coolant" warning flashed up. I shut the car off and checked the reservoir and it was low but not empty.I was close to needing an oil change, so I had that done and when they popped the hood the reservoir was full and didn't need coolant. They only change oil there but said it was a thermostat issue. I haven't noticed any leaking, the heat works great and the temp indicator never moves, which I look at a lot. The temp outside went way down overnight. I hate to bring it in since they will sell me on this and other things. Any suggestions?

My car has 95000 miles.
My car has an automatic transmission.

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