I bought a used 2007 chevy impala and my temp gauge does bot work. I also have the error code engine hot ac off on the dash board. I had the diagnosis ran and it came back the tempature control sensor. I had that changed and also replaced the thermostat, i have charged my ac and coolant levels are fine. I still have the message on the dashboard engine hot ac off. I have another scan and now i am getting tempature control sensor high voltage. What is this and how can i fix it?

 

I also have the error code engine hot ac off on the dashboard. I still have the message on the dashboard engine hot ac off from time to time. Overtime or after I complete my journey to my place with the car turned off the error code disappears. Along the way, one could scan the car and reset the codes.