So recently I noticed my AC isn't working. It was working in the summer so no idea what happened. The only time I've gone messing with anything that might have messed it up was when I installed a stereo.

The thing that makes me think maybe the AC is fine is that when the AC is off and the temp slider is set to cold the air still blows hot. Not to say it should be ice cold but shouldn't it at least be cool if the outside temp is pretty cold? I just get hot no matter where I set anything to.

I'm thinking maybe I messed up the controls somehow when I took all that apart? Any theories?

If I hit the AC button the idle speed changes so I can at least tell you the compressor engages if that makes difference one way or another.

 

Without the AC on and the slider set all the way to cold my car just blows whatever air temperature it is outside. So yes if it's cold out it blows cold air. Since you installed a stereo I would start by checking the connectors and wires on the back of the climate control unit. Make sure you didnt clip any wires or bend any of the connector prongs.

 

It sounds like a problem with your blend door.

 

Haven't had a chance to mess with it as I've had several other issue's pop up but I was thinking the same thing. The other piece of evidence that would support this is the fact that I can feel air flowing in even when the blower is turned off and the air is set to recycle.

 

The blend or air mix door sounds like a good suspect. I had to replace the motor that operates it on my 97. There is a self diagnostic you can run if you have the auto climate system. It starts on page 37 of the HA section

 

Negative, I am rolling GXE so it's base environmental controls for me.

 

What you can do then is get down in the passenger side foot well and look at the bottom of the big white air duct box that is mounted on the center of the firewall. You will see a small black plastic motor about 3 inches square. This motor controls a door inside that directs the air through the heater core or by passes it, depending on the control panel setting. With the ignition switch on (car does not have to be running) and watching the air mix door motor, move the temperature lever on the control panel from one end to the other. You should see the arm on the motor move. If the arm doesn't move, you have found the problem area. The motor could be bad or the dash control panel could be bad. You would have to follow the FSM for how to diagnose this. The motor for my 97 Max cost me total $71 (got screwed on shipping).