WTF does Max A/C do?

[101lifts2]

Originally Posted by fasternyou929

So two decades in the industry and you think GM builds a quality product and think cars have either a Max AC button OR recirculate. And I'm the one that doesn't know what he's talking about. ...

It doesn't matter that is SAYS MAX AC, what matters is what it does. FWIW, my 2011 Mazda 3 has both, but the MAX A/C does nothing but ensures that the Hot/Cold is all the way to the full Cold. The condensor fan runs whenever the A/C is turned on regardless if it is all the way to the Max AC position. The Recirc button does just like it says. Recirculates. Why they even put "Max A/C" I can only guess is so the clueless don't leave it still in the "blue", but not all the way in the full blue range. Ford, GM and Chrysler always used only Max AC, which forced recirculation.

...All cars I own kick on the auxiliary cooling fan as soon as Max AC is selected......

Well, apparently you have not driven a GM, VW or Mazda because they don't. The A/C fan on all GM vehicles was always a function of the A/C relay ON and A/C high side pressure. I would be that Max A/C does not even have a signal to the body controller. My Mazda 3 runs the A/C fan when the A/C is on and the A/C high side pressure is above a certain threshold. Max AC is not any type of input.

So now the question remains....do you have BOTH a recirc. button AND a MAX A/C button? Or do you have a Recirc button and lettering that says Max A/C because then Max AC doesn't do anything.

I should have said that Max AC acts as a recirc function if you don't have a button. If they put both there, the MAX AC is only to make sure you put it to full cold.