In article .com>,
says...
> Sorry. I'm new at this.
>
> It doesn't matter what setting that it is on. When turning left, the
> blower will blow according to the setting on the control panel.
>
> Sometimes, it will continue working for 4-5 minutes and then go off
> again. When it goes off, I can hear a humming sound as if it is trying
> to run. Turn a left, and it kicks on again.
>
> This weekend, it completely quit. There was no sound and no air no
> matter what. Then today I got up and it was miraculously working again.
>
>

I'm still not completely filled in here... So you're saying that that
your blower usually does not work at all any other time?

It sounds like the last resistor in line for your "Blower Motor Resistor
Card" is hanging loose and reattatching itself when you turn left. If
you put it on High your resistor card gets bypassed. So if you cannot
get "low, med, & med high" to work and "High" does work it will likely
be your resistor card.