I am not a pro at this yet.
I wish they showed the back here - http://www.ebay.com/itm/390532515474
This one does look different - http://www.ebay.com/itm/160961559762
Actually the controller look just like mine http://www.ebay.com/itm/330702487102, but this is from 2003. The only thing I don't have is the rear defrost.
There are very few of the earlier models that have that.
Look closely at that picture because folks can get them mixed up.
There is this one
and this on the 99- 02 models
One has automatic climate control whereas the other does not.
You cannot see the back but the plug is different and the systems are built and work differently so even those two are not interchangeable.
For one thing the automatic versions will not under any circumstances turn on the A/C for heat exchange if the outside temperature is below 40 degrees Fahrenheit.
The manual version will though. What I am saying is that there is more logic built into these individual systems that just trying to match the wires will not work even if you could figure out to match all 31 wires that are found in the back of mine.
Moving on the the digital versions.
I did not mean the A/C was digital but rather that the controller as a digital display for its functions as evidenced by the LCD screens
Those also have a different set of logic that will even need to be programmed into the cars computer.
Another thing is the wires themselves.
I am sure if you were to pop the wire harness plug of the controller , you wiil find that the number of wires that are there is less than the total number we saw on mind.
That means yo will also need a new wiring harness and be able to take your dash apart to run it in the dash like the factory wiring. Thi is just the tip of the iceberg.
Wish you luck if you ever find a means of swapping it out
Dluvr22, can you just post the Ebay item numbers, for some reason they're not going through on the link. I wanted to see the difference.
Here are pics I pulled from google
The first one is manual only .
Notice the word "Auto" before the off on the fan knob as well as the vent setting on the second pic.
You will also see that the fan speed has only 5 settings on the manual version where there are a lot more on the automatic.
these two are not interchangeable as the systems they run are completely proprietary.
Then you have these.
None of them can be interchanged with the other without major modification to the A/C system in the vehicle.
Sorry GM did not make it easy on this one.
I see now. Thanks, have to figure out something else.
The only change you can make to the first two would be to replace the knobs with thee Caddy version which looks like the knobs on the bottom 2 images but bigger to fit the top 2 images