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I really did not care so much if the AC came on with the defrost, but after discussions on this board and verifying it on my 2003, the AC will stay on until you turn off the truck or the fan. This is such a silly engineering design in that the AC stays on even when you switch off defrost.
So last night I fixed it. Now I have to press the AC button if I want the AC on w/defrost.
If you have big hands you will need to find someone to do this for you.
At least on the 2003/2004 you have to remove the glove box and the housing around the radio and gear shift. Removing the radio housing will allow you to get a couple fingers at the screwdriver to hold it while your other hand can turn it.
Once you have the housings off you need to look up under the dash where the glove box was to the back of the AC controls. Now turn the A/C knob to defrost and watch how the mechanical system works when you do it. You will see the plastic mechanism move to the right and trip a switch. The switch is black and looks about the size of a piece of Chiclets gum with two green wires coming off it.
This is the switch you need to remove. So get the smallest screwdriver you can find and undo the screw (this is a pain). Once off, I do not recomend letting it dangle because if it were to ever get wedge into something back there your A/C would be on all the time. I took the switched turned it around and put the screw back in it.
There all done, full control of the AC.
So last night I fixed it. Now I have to press the AC button if I want the AC on w/defrost.
If you have big hands you will need to find someone to do this for you.
At least on the 2003/2004 you have to remove the glove box and the housing around the radio and gear shift. Removing the radio housing will allow you to get a couple fingers at the screwdriver to hold it while your other hand can turn it.
Once you have the housings off you need to look up under the dash where the glove box was to the back of the AC controls. Now turn the A/C knob to defrost and watch how the mechanical system works when you do it. You will see the plastic mechanism move to the right and trip a switch. The switch is black and looks about the size of a piece of Chiclets gum with two green wires coming off it.
This is the switch you need to remove. So get the smallest screwdriver you can find and undo the screw (this is a pain). Once off, I do not recomend letting it dangle because if it were to ever get wedge into something back there your A/C would be on all the time. I took the switched turned it around and put the screw back in it.
There all done, full control of the AC.