Question: A/C air recirculation

[A1Avette79]

I live in Florida and our outside temperature is hot in the winter and hotter in the summer. My a/c works great at night or on rare cool days but struggles on hot days especially in city driving.
Newer cars have a "recirculation" mode for the a/c to allow the user to re-cool inside air instead of constantly trying to cool down hot outside air. I read somewhere that you should run your a/c on the recirc. mode most of the time for cooling efficiency and occassionally run it on outside air mode for a few minutes to eliminate moisture (mold) in the system.
Can C-3's be modified to work this way? Does anybody make a flapper valve kit that can be installed in the a/c ducts?
Are there any improvements that can be made to the fan for additional cooling in stop and go traffic?
Thanks,
Trenton

 

[76okievette]

I belive the Max air postion provides air recirculation where Normal position continues to use outside air.
Here in Oklahoma when its 102 in the shade, I don't get much A/C at all. I sloved the problem by purchasing a brand new 08 which I will drive on the "hot days".

 

[A1Avette79]

I wish I could solve my problem the same way! Unfortunately my 79 is my only transportation.

 

[JohnZ]

The "Max" mode is recirculation - the others are outside air; you don't have to convert anything if your system is working properly.

 

[dmdodd]

The "Max" mode is recirculation - the others are outside air; you don't have to convert anything if your system is working properly.

As JohnZ said, Max position should shut the internal doors that draw air in from the outside. If this isn't happening, maybe there's a leak between the door (think there's only 1 on pax side, in footwell) and plenum, or the vacuum supply to the door isn't working.

This article might help with the re-circ doors:
http://home.comcast.net/~chadwick.robert/ventilation.htm

and the diagrams and attached document in my post on this thread are good for trouble-shooting HVAC vacuum issues:
http://www.corvetteactioncenter.com/forums/showthread.php?p=915573#post915573