Continuous fan operation and stop light stop per second

The fan has been turning off and running at high speed according to regmen's head for not having a heat in my car for 1 week. In doing so, there was no stop light, but now the room has started flashing for a second. I would be very happy if the friends who had an idea or idea about the topic helped, and when I get in the car because of the malfunction, I get depressed.