Trailblazer 2003 - L6 - Thermostat

What should the gauge read when the car is running and warmed up? My gauge was at less than 200 degrees. A warning lite told me that there was a problem with the cooling system. Code said that it was the thermostat. Replaced it. Now car runs at 210+ degrees. Isn’t this a problem?

Nope, that’s right in the correct range for normal operation.

210 is just about perfect. The radiator cap and the anti-freeze mixture allows the engine coolant to exceed 212 degrees fahrenheit without boiling. All is well, don’t worry.