Hacks I've noticed that tell me when my engine or battery is getting too hot and I need to respond.

There has been a couple glitches in my car that I realized was my car trying to tell me something. I don't know if this would be true for you but in my experience it is.

1. When my engine is running too hot on a couple occasions (for whatever reason it was) my passenger side LED headlight would flicker like my light is going bad. It wasn't though and I figured out that the light was responding to my engine getting too hot. After engine was cool the light returned to working as usual.

2. The battery cooling fan or the access to airflow. My Bluetooth disconnected. When I stopped to check why my music wouldn't play, it said I had no devices connected but then would not let me connect to it. While stopped I noticed my stuff had covered the vent inlet to my battery cooling system. I removed the blanket and after the battery cooled off the Bluetooth music resumed working. This also happened on multiple occasions, being that I go camping and accidently cover the inlet hole on the side of the rear passenger seat.

In addition to these two little ways my car hints to me is my car seems to be ticklish. I'm sure there's some kind of sensor here causing it to respond at this moment and the fact I likely had the key in my pocket but when I'm using the self serve car wash and I proceed to wash the bottom portion of my doors ( exactly where I imagine a car would be ticklish if it was) my car sounds a long warning beeb tone and notifies me my key is not in the car. Like I said there's likely a reason for this and sensors but I swear my car is ticklish. Puts a whole new thought on it being a smart car. If you know these cars well enough to explain why it does these things I'm all open to hear what you have to tell me other than that I swear my car talks to me by using these things that I notice.

Have you had and Bluetooth connecting problems?
Have you replaced your headlights thinking why did they go bad before they should have?
What's your experience?