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--------Changing HVAC Color----------
1) Pop off center vent panel and remove vents and the trim around it. The vent will be held in by a wire on the right of the vents, which pops off if you pull it to the right.
2) With the trim and vents removed, you now have to remove the trim around the radio and HVAC, it is all one piece that pops off. I use a flathead screwdriver, and go around it and pry it out.
3) Now, Put your hand into the hole where the vents were. The a/c bitton console needs to be removed. First unplug the wire that leads to the a/c console. After that, there is a push button on top of the console, near the front. Push it and push the unit towards yourself, it will slide out. Set it aside.
4) This is kind of hard. Right below where the a/c switch was is a very small 'nub' which houses the stock light for the HVAC. Find the nub using your finger(s). It needs to be turned to your right about 1/4th of a turn. It is very tight and hard to get to because it is so small. I used a pair of needle noses pliars, turned it to the right and pulled it out. (It pulls away from you). You will get frustrated with it, its a bitch but you'll get it. After it is out of its socket, follow the wire connected to it, and unplug it from its harness. You just unplugged the power to the stock LED.
5) Now take the fixture you just removed inside onto a table. You'll need some wire, scissors, a 330ohm resistor, a blue LED, electrical tape, and patience. Now, snip the two wires as close as you can to the stock bulb. The bulb is in a little case, just snip that thing off leaving as much slack as possible. Now you should have a harness with 2 wires coming out of it.
6) At the end of the wires, shed the insulation from the end of the wires and show a little of the bare wire on both. Twist one of the bare wires around the end of your resistor, then use elctrical tape and cover the connection you just made. At the other end of the resistor, use wire and connect it with one of your LED metal leads. Then tape over your connection. With the other wire coming from your harness, connect the end of the wire to more wire, so you have a little slack. Fron the extra wire you just added, connect it to the other LED metal lead, and tape your connection.
7) Make sure all connections are solid. Press the tape together very firmly. Take your little rig out to your car, and plug the harness back into the other part of the harness from which you removed it. Now, with it plugged in, turn your lights on, the LED should illuminate. Make sure it does, then turn your lights back off. Now you have an LED that needs to go where it came from. push it gently back into the hole from which you removed the stock bulb and use tape to secure it in place. Then take your a/c control which is sitting wherever you put it and slide it back into its place, and dont forget to plug it back in.
8) Then, take your vents and push them back into their place, and dont forget to connect the wire on the right of the vents, it will snap back in. Push the vents into place and then place the vent trim back on. After this snap the HVAC trim back on over everything.
9) You now have a blue HVAC 
This can be done with other colors, but there are stipulations. I used a 3.7Volt blue LED and a 330ohm resistor together. If you have a different voltage bulb, im not sure what resistor to use, a 330 may work.
This mod looks very cool at night, but if you try during the day it will be tough to see the illumination.
I'm sure Jasons (iamnotwhoiam) write up will be a bit easier to follow, and he'll have pistures, but for those of you that are eager this is the same deal.
I'll type a quick 'how to' for the gauges either later tonight or tomorrow, my fingers are tired..
If there are any further questions, feel free to e-mail me.
______________________________
Ryan
IRyanHester@Hotmail.com
'03 Mazda 6s
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