Overheating

P1536 CADILLAC - Engine Coolant Overtemperature Air Conditioning Disabled...Possible causes: Faulty Engine Coolant Temperature Sensor, Engine Coolant Temperature Sensor harness is open or shorted, Engine Coolant Temperature Sensor circuit poor electrical connection...Description, The A/C compressor requested by HVAC controller, the Powertrain Control Module (PCM) detects the Engine Coolant Temperature (ECT) input was over 257°F, or with A/C compressor operation requested or not requested by the HVAC controller, the ECT input was over 248°F.

Okay, I just replaced the thermostat and flush and filled it. It overheated while driving it. Does the coolant system need to be burped?

I know it's self purging. While putting the coolant in, it took a long time to fill.

I would purge the cooling system, always needs to be done when work has ben done. Here is a video on how to purge the cooling system... https://www.youtube.com/watch?v=xeTgmdRkQtY

The only thing with that video is put the radiator cap back on before you shut the engine off.

Should the car be raised up?

Sorry, had to take the dog for a walk, but yes, having the front end up on an incline or raised up certainly helps.

Okay did the purge line and raised car up. Still overheats.