Q: Check engine light on

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Took to part store and got a diagnostic test it said something about the thermostat, car not overheating, I know that it's more water than antifreeze was thinking about getting coolant exchanged

My car has 125375 miles.
My car has an automatic transmission.

If the thermostat is stuck open the computer will set a code for it now getting to operating temperature as fast as it should. You should have thermostat replaced and coolant changed to try and fix the codes.

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