the blower motor will be working, then stop. Or I might turn on the engine to find it isn't working. It may not work for days, or just minutes. Doesn't seem to matter if the switch is on or off when I start the engine.
It was replaced about 2 years ago and always sounded awful. I always wondered if they really installed a new one. Couldn't go back to that mechanic to check it out, the shop closed.