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-   -   WTF does Max A/C do? (http://www.twowheelfix.com/showthread.php?t=14701)

Homeslice 07-17-2011 10:00 PM

10 seconds? Doubt it. I don't drive big old American cars with awesome AC, so it takes awhile for my AC to get cold. I would rather use the Normal setting for the first 30-60 seconds so it can force hot air out, before swtiching to Max.

Adeptus_Minor 07-17-2011 10:34 PM

I thought Max engaged the secret R12 subsystem for that extra bit of cooling that R134a alone just can't give.

fasternyou929 07-17-2011 11:31 PM

Quote:

Originally Posted by 101lifts2 (Post 481792)
Dude I'm a service engineer for a car company...and have worked with car companies since I was 22. If I know anything in this world...it's cars. redflip You guys just guess at shit...or try to analize things using general common sense. Your original statement that the compressor cycles because of "Max A/C" or "Normal" just is not true.

Those that have Max AC and a Recirc button is simply for air venting direction (Max AC) and then % outside air using the Recirc button.

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. :lol

All cars I've driven have both. All cars I own kick on the auxiliary cooling fan as soon as Max AC is selected. Observation skills bordering on retarded should still allow you to at least gather that if cars have been your life for 22 years. If I was wrong about the compressor, so be it, I'm not opposed to learning from someone here. Provided they at least come across as knowledgeable, beyond just claiming to be while regularly showing otherwise. redflip

101lifts2 07-18-2011 12:57 AM

Quote:

Originally Posted by Homeslice (Post 481808)
10 seconds? Doubt it. I don't drive big old American cars with awesome AC, so it takes awhile for my AC to get cold. I would rather use the Normal setting for the first 30-60 seconds so it can force hot air out, before swtiching to Max.

Or you could do what everybody else does and roll the windows down until it gets cool?:idk:

101lifts2 07-18-2011 01:21 AM

Quote:

Originally Posted by fasternyou929 (Post 481820)
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. :lol...

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.

Quote:

...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.

Homeslice 07-18-2011 01:34 AM

Quote:

Originally Posted by 101lifts2 (Post 481834)
my 2011 Mazda MX3

:?: no such car

101lifts2 07-18-2011 02:00 AM

Quote:

Originally Posted by Homeslice (Post 481835)
:?: no such car

I meant Mazda 3. I don't why I added MX the first time I mentioned it..so I'll change it.

Particle Man 07-18-2011 07:12 AM

Quote:

Originally Posted by 101lifts2 (Post 481831)
Or you could do what everybody else does and roll the windows down until it gets cool?:idk:

Careful! He will attempt to "convert" you now!
:eek:

Particle Man 07-18-2011 08:10 AM

Quote:

Originally Posted by 101lifts2 (Post 481834)
If they put both there, the MAX AC is only to make sure you put it to full cold.

bzzzzzzzzt- sorry, but thanks for playing. Tell him about his fabulous door prize, Al!

(just selected "MAX A/C" and turned the Temp into the red zone and, woe and behold, hot air came out)

Not trying to bust your balls (okay, maybe a LITTLE) but not all cars function the same way. ;)

anthonyk 07-18-2011 10:05 AM

Wow, you guys put a lot of thought into this whole windows-up windows-down thing. :lol:

I wondered the same thing about Max A/C when I was a kid. Our AMC Hornet (yeah, baby) had a label on the knob that said "Max A/C - Desert Only" or somesuch. I spent many a family vacation (of the non-desert variety) wondering from the back seat what would happen if we turned it on.

I was pretty disappointed when I got older and realized it was just a recirc control. :lol:


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