Possible Mod to AC System. Is it a good idea?

[Huw Powell]

> On the 4000 & Coupe GT (possibly UrQ, but I don't know) when you flip the AC switch to on, the system uses vacuum to close the fresh air flap, putting the system into recirculation mode. In theory this help get colder air because the already cooled air keeps getting recirculated through the system getting colder and drier with each pass. But on many days, the sun heats the interior to well above outside air temp, so in all reality this forced recirculation may delay the cooling affects because it has to catch up to the outside temp. Right? So my thought on a mod would be to add some sort of recirculation switch that would allow you to choose between recirculation and fresh/outside air when the AC system is on. From my train of thought it shouldn't be hard to add. When the AC switch is flipped, it a vacuum actuated lever flips the flap closed. You could add a device that would block or vent this vacuum when you want fresh air to go though the AC system rather than recirculated cabin
> air. So, what are your thoughts on this? Good idea? Even possible? Any thoughts on how?

Possible, but not useful in the way you want it to be - that flap alters
the source of the air - from outside, to inside - and "inside" is where
the AC evaporator is.  In other words, the only way for you to do what
you want is to move the evap somehow, or seal it off from the interior
and add ducts from outside to feed it.

--
Huw Powell

http://www.humanspeakers.com/

http://www.humanthoughts.org/