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Oh, I forgot, but it should be the very first step you all take. Check your coolant levels. Mine was low. $35 recharge kit at walmart fixed it. It didn't fix the problem, but at least it takes it out of the equation.

If anyone is still out there and interested... I'm in the middle of going through this now, here is where I was, and am at.... My AC turned hot one day, the next day it was cold, then turned hot again, and now it is only cold for a second no matter what, before it turns hot. I followed the workaround with the resistor. Except I had the blue plug, and wire 14 was missing on mine, so I cut 13 and 15 and used male connectors on those wires, and female connectors on a 47k Ohm 1/4W resistor and it worked. I also put female connectors on the wires coming out of the blue plug. This is important to do because in my workaround fix, I got AC through main vents or nothing at all. Meaning, if it rained, my defrost would not work, heat will not work. So, in a few seconds, if I run into rain or a cold day, I simply unplug the resistor and plug the car back in. Also, you must turn the AC off and run the fan a few minutes before you shut the car off or you will get a nasty smell (mildew). Ok, so, I attempted to replace the sensor. it did not work. Fearing that I bought a bad sensor (chances are slim to none), I tested the old sensor's continuity, and it was fine. So, for all the people it did work for, congrats. It took me about 6 hours to pull my dash forward, swap sensors and replace dash. But I saved about $700, especially considering that wouldn't have fixed it. So now, I just stumbled across this forum and post. JS_Bethlehem, THANK YOU!!! For everyone that keeps asking if the solution he posted worked, he said it did. So, I'm onto my next step. In the meantime, the workaround works amazing, and is helping me keep my sanity. My first next step is to try to replace the blend door motor (AE5Z 19E616A), because it's cheapest ($50). (why did my text turn blue?) . My next step will be to try the control module (9E5Z 19980G) because it's more expensive ($250). I'll post results, but after a month of researching and tinkering and becoming frustrated beyond belief, this is the first post to have a logical answer and solution.. For the first time in a month, I'm hopeful.