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2006 Impala Coolant Sensor Replacement
This may, or may not, help you locate the sensor.
The video is for a 2006 Chevy Impala that has the 3.9 v6 engine.
Hopefully one model year difference did not change the engines...
My experience has been causes for over heating was.
leak and low coolant, fan not running if you have 2 fans one come on when A/C is turned on the other comes on when engine reaches operating temp. I have had thermostat stuck closed, radiator cap not sealing, fan fuse or relay, temp sensor not working temp sensor could keep your fan from coming on, I have also had to change a couple radiator but it was due to leak. I have heard of some where radiator was blocked up, I think those were issues of stop leak was used for many years.
Need to have a code, running rich could mean a lots of things, temp sensor, o2 sensor, fuel pressure to high, get the code and come back, if the mechanic wont give you the code for free, go to auto zone in your area, free code riding.