Blower fan motor no A/C

[truckin 79]

No RF interference luckily just like a whirling noise in low position. If for some reason the radio stopped working and I had to just listen to fan motor on low speed it might get annoying. I might try and get another fan motor when it warms up in the spring time and replace since it is a lifetime warranty part. It is a little too cold in CO right now to mess with it, I am just glad it keeps truck warm and does not squeal on start up. I am sure the neighbors appreciate that.
So just to be clear on non-ac cars the switch is off-low-high, is that correct