The UEC is the rectangular box between the battery and the drivers side fender. There are control and power lines that run from modules through that box and then go up to the ECM or various other places.Reggies, can you expand on that a little? Which "underhood control center" are you referencing? The black relay box on the cooling fan shroud?
Did you try to bypass the relay to see if the compressor will start? See my post here:I already tried to recharge my system with Freon and that did not work. The A/C Compressor still would not come on. The A/C compressor relay works fine as I tested the relay near the battery. I took a multimeter and hooked it up to the compressor and there was no power going to the compressor. What else do I do? Also, worst case scenario, how much am I looking at spending?