When I turn on the heat or air in car it will putter for a minute and then completely cut off. My car has 5 speeds of air. 1 and 2 have never turned the air on but 3,4, and 5 have alway come on. Now, after the air/heat cuts off I have to wait a few minutes and then the air/heat will putter back on for 5 seconds and cut off again. I don’t think it is the motor because the fan wouldn’t put at all if it was the motor. I am thinking maybe resistor?
When you lose some of the fan speeds it’s usually the resistor pack that’s bad.
It also can mean the blower motor is going out and drawing more current causing the resistors to burn out.