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For the last couple of weeks my A/C has been acting crazy with a mind of it's own. I get in the car start driving A/C blows on low speed and after 10-15 minutes it jumps to max speed. So that a sign of my Final Stage Resistor starting to go bad.
 

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Charging does not help.
Turn car electronics on, don't start th engine, keep the door open and if you get low batty sign in 5 min then it's bad battery.
When battery gets weak, car starts shutting down non essential functions and changing Ac speed is non essential.

When I had the same problem I had batty checked by dealer plus 2 independent mechanics, and all said battery was good. I Gen had a resistor behind the instrument panel replaced.

Finally I did procedure outlined above, low battery popes up. I replaced the battery and AC HAS been working well.
 
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