Engine Hot A/C Off

It's telling you the engine is overheating and you need to shut it off. If the engine isn't over heating it may be bad coolant sensor causing this. I would start by scanning the computer for codes to see what it is recording as a failure, this will give a starting point

See the guides below

https://www.2carpros.com/trouble_codes/obd2

https://www.2carpros.com/articles/coolant-temperature-sensor-cts-replacement

Hi,

It seems as though the engine is overheating, but the idea that it happens when you turn the seat heater on is odd. What I suggest is to have the CAN bus system scanned. CAN stands for computer area network. If you do this, it should indicate if there is a break down in communication in the network and specifically where it is happening.

Here is a video showing how it's done:

https://youtu.be/InIlnsjOVFA

This is what I suggest. If you find it isn't related to the seat heater, let me know. Also, confirm coolant is full and clean.

Let me know what you find.

Joe