AC Button HVAC Mod

1.  Pull of the plastic cover covering the HVAC controls using a flat head screw driver.  Then pull out the piece above the HVAC controls which has your rear wiper switch, hazards, and defroster buttons.  A flat head screw driver or something else to pry in there will help.

2.  Look back there and you should see your AC button sticking a few inches back.  It's pretty long.  Disconnect the harness connected to it then press down on the top of the button where there should be a little tab.  While pressing down on the tab push the AC button towards you and it should slide right out.

3.  Now you have the entire AC button out of the car and now you need to take the AC button apart.  There should be two little tabs on the side of the button so push those in and pull on the button and it should pull out of it's housing.  Now take the circuit board out of the plastic button piece.  It should just kind of snap out.

4.  With the circuit board out take out the stock LED by giving it a half a turn and it should pop out of it's little hole on the board.  Now you're going to place the new LED in the spot where the old one was.  First we need to find out which little terminal thingy was positive with the stock led.  If you follow the circuit board of the terminal closest to the little green LED on the end on the board, then it will match up with the prong on the left, which matches up with the green wire with white stripe on the AC button harness, which is positive.  So take the LED and set it in the same position the stock one was, but make sure the positive lead on the LED is touching the positive terminal. (remember the longer lead on the LED is positive).  Now bend the positive lead down so it sits more flush against the positive terminal and sodder the two together.  Then bend the negative lead of the LED to sit flush against the negative terminal and sodder those two together.  Then trim the excess leads off.

This pic might also help.

Also instead of pointing the LED down you may want to point it straight towards the button if you can get it to sodder that way.  I left mine pointed down and the light is kind of weak so I am going to point it towards the switch sometime soon.

5.  Now put your AC button switch back together, but don't put it back in the car.  Go in the car and look at your AC button harness which you disconnect earlier.  There should be a green wire with a white stripe in one corner of the harness and in the opposite corner there should be a black wire with a yellow stripe.  The green wire with a white stripe is your positive wire and the black wire with yellow stripe is the negative wire.  You now need the resistor which needs to be soddered on to one of the wires.  I always sodder mine onto the positive wire, so just cut the wire and sodder the resistor in between the ends which were cut.  This is actually the hardest part since you have to sodder in a tiny space.  Once done wrap it up with electrical tape or heat shrink and put everything back together and you should have a nice blue AC light :-)