I was driving my car perfectly fine when all of a sudden the obnoxious add coolant buzzer starts blaring. Pull over turn car off pop the hood and see if there's any leaks or anything, nothing. Start the car back up coolant buzzer is gone. I limped the car back to my shop just in case and let it cool down then checked the coolant at the thermostat fill neck, I haven't lost any coolant, there's still coolant there, the car doesnt overheat in the 100⁰ summer. So I'm wondering what caused the buzzer to go off, faulty sensor or what?

 

If your coolant is full and bled properly, it sounds like you have a faulty sensor, wiring or ground issue.