Matrix's AirCon control is always by default return to fresh air mode
after you turned off your engine.. find that's it **** of inconvenient..
this DIY mod will be able to set the default to always closed at recycle mode.
There is 2 step to be done,
1st is the air con control unit,
2nd is to reverse polarity of the aircon flap above the air con blower/filter.

You'll need to remove the centre console 1st,
refer to here for How To Remove Matrix's Centre Console
http://www.hyundai-forums.com/t25794-how-t...tre-console.htm

Here goes Part 1:-
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Insert the scrapper and pry open the plastic casing, pulling off the
speed knob 1st will make it eassier to pry open

(IMG:http://i15.photobucket.com/albums/a361/lavitared/AirconMod/DSC08094.jpg)
(IMG:http://i15.photobucket.com/albums/a361/lavitared/AirconMod/DSC08095.jpg)

Air Con main control unit
(IMG:http://i15.photobucket.com/albums/a361/lavitared/AirconMod/DSC08128.jpg)
Right Side Recycle Button with stock green LED
(IMG:http://i15.photobucket.com/albums/a361/lavitared/AirconMod/DSC08129.jpg)
Left side Air Con Button with stock green LED
(IMG:http://i15.photobucket.com/albums/a361/lavitared/AirconMod/DSC08130.jpg)
Desolder both LEDs from the back and pull out The LEDs including the plastic holder
(IMG:http://i15.photobucket.com/albums/a361/lavitared/AirconMod/DSC08133.jpg)
Stock Green LEDs with the plastic holder
(IMG:http://i15.photobucket.com/albums/a361/lavitared/AirconMod/DSC08138.jpg)
Prepare 820 ohm resistors and LEDs
(IMG:http://i15.photobucket.com/albums/a361/lavitared/AirconMod/DSC08140.jpg)

After removing the LEDs look for the 3 small holes on the recycle button (right side)
(IMG:http://i15.photobucket.com/albums/a361/lavitared/AirconMod/DSC08141.jpg)
Close up
(IMG:http://i15.photobucket.com/albums/a361/lavitared/AirconMod/DSC08144.jpg)
Insert a New LED with the positive (+ve) leg into the right hole
(previously occupied by the stock negative(-ve) LED),
and the -ve leg of the new LED into the the small
centre hole below it. Pictures here show the new LEDs in place,
leave the original +ve hole empty for the time being,
you may wish to remain stock green LED,
just follow the above step with the original LED instead of a new one..
(IMG:http://i15.photobucket.com/albums/a361/lavitared/AirconMod/DSC08152.jpg)
.jpg[/img]

Turn over the pcb board and solder the +ve, next solder the -ve
leg to the ground on the pcb board.
(IMG:http://i15.photobucket.com/albums/a361/lavitared/AirconMod/DSC08161.jpg)
(IMG:http://i15.photobucket.com/albums/a361/lavitared/AirconMod/DSC08163.jpg)
cut the resistor to shorter length
(IMG:http://i15.photobucket.com/albums/a361/lavitared/AirconMod/DSC08166.jpg)
insert the resistor to the empty +ve hole and solder
(IMG:http://i15.photobucket.com/albums/a361/lavitared/AirconMod/DSC08168.jpg)
next, solder the other end of the resistor to the +ve led of the new LED
(IMG:http://i15.photobucket.com/albums/a361/lavitared/AirconMod/DSC08173.jpg)
(IMG:http://i15.photobucket.com/albums/a361/lavitared/AirconMod/DSC08191.jpg)
Next, insert a new LED into the left side of the pcb board of the air con control unit with the original polarity and solder it,
cut away excess length after soldering
(IMG:http://i15.photobucket.com/albums/a361/lavitared/AirconMod/DSC08176.jpg)
If you wish to remain stock green LEDs, the above step no need to do...
Whola you're done...happy DIYings...

*disclaimer: this mod is for sharing, in no way will the poster be responsible for any mishap or damage done...

surface mount LEDs on my air con control...
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surface mount LEDs are **** small not easy to solder..
however it offers a consitant shade of White color...
completed LED mod on my Air Con Control
(IMG:http://i2.photobucket.com/albums/y30/chris_9933/AirConMod/MatrixAirCon0010.jpg)

DIY Air Con Mod Part 2
For those who don't want to do above mod still
can set your air con to default close position by doing this simple DIY mod..
that is, at your air con contol unit, the recyle LED will not light up- Closed Postion,
all you need is your hands and a long screw driver...
this is Part 2 of the Mod.
Picture show the air vent at open position, ie,. taking fresh air (sometimes
is polluted exhaust gas from other motorcars
(IMG:http://i15.photobucket.com/albums/a361/lavitared/AirconMod/DSC08229.jpg)
PIcture Below is Closed Postion at Recycle Mode
(IMG:http://i15.photobucket.com/albums/a361/lavitared/AirconMod/DSC08196.jpg)
Notice the 2 LEDs above the blower, those are my DIY glove compartment lights
1st start by opening up the glove compartment :-
Next, remove the cable stopper indicated with your fingers
(IMG:http://i15.photobucket.com/albums/a361/lavitared/AirconMod/DSC08197.jpg)
With the help of your index finger or long screw driver, push the stopper and
pull the cable to one side to easy access the white cable connector in the background
(IMG:http://i15.photobucket.com/albums/a361/lavitared/AirconMod/DSC08199.jpg)
With the help of your index finger push the clip on the left of the connector,
together with a long screw driver, remove the air con ventilation wire connection:-
(IMG:http://i15.photobucket.com/albums/a361/lavitared/AirconMod/DSC08204.jpg)
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Push out the connect once you have remove it.
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use a long screw driver to pry open the connector clip,
(IMG:http://i15.photobucket.com/albums/a361/lavitared/AirconMod/DSC08215.jpg)
Next, push the copper pin out
(IMG:http://i15.photobucket.com/albums/a361/lavitared/AirconMod/DSC08220.jpg)
(IMG:http://i15.photobucket.com/albums/a361/lavitared/AirconMod/DSC08219.jpg)
continue to push the other pin out and connect back by swap position,
remember- must swap position
(IMG:http://i15.photobucket.com/albums/a361/lavitared/AirconMod/DSC08225.jpg)
After having swap the copper pin positions (reverse polarity), fold the connector
wire in a U position for easy assembly back into position
(IMG:http://i15.photobucket.com/albums/a361/lavitared/AirconMod/DSC08226.jpg)
With the help of both hands, place back the connector into positon
(IMG:http://i15.photobucket.com/albums/a361/lavitared/AirconMod/DSC08228.jpg)

if you can do above till here, your DIY mod is completed..
place the gloove compartment rubber stopper into postion and wowla,you done!!!

Happy DIYings folks..

this complete the above Mod... good luck..