On Fri, 26 Feb 2016 08:05:16 -0600, Vic Smith
wrote:

On Thu, 25 Feb 2016 23:26:00 -0500, wrote:

On Thu, 25 Feb 2016 19:55:48 -0800 (PST), DerbyDad03
wrote:



No, fresh air is standard - and MAX AC does nothing to the fan speed -
or at least it didn't when I worked on Toyotas and doesn't on any of
the cars I currently am aquainted with. ALL Max AC did was put the
system into recirculate mode.

I don't recall which cars it happens/happened in, but hitting the Max
AC button without a doubt increased the fan speed. I've never had a
Toyota, so maybe they do something different.

The fan sound changes because it is sucking air from inside the car
instead of outside the car -

Every GM car I've had MAX is a higher speed on the fan.
Not just sound - fan RPM. It's obvious.
I've only had one air conditioned GM vehicle . It was a '95 Tran
Sport - and the fan speed didn't change with Max AC selected.
On the Tauris if I do not have automatic climate control turned on,
MAX AC soen't change the fan speed eiter. If automatic control is
enabled, hitting MAX AC shuts off the automatic control and it is
POSSIBLE tha the fan then goes to max. I'll have to remember to check
when I get into it next. (I usually use the Ranger - and the "McGiver
AC" does not have any fancy controls. It is a standard non-AC truck
with an AC Evavorator added to the system, along with an on/off
switch.