[plumber452]

I recently purchased the same harness from BP Automotive and after some lengthy searches I've found that from 03 on up the Green/Blue connectors PCM do not have an A/C request. The PCM receives its signal through a serial data line coming from the A/C Heat switch module in the dash of the original donor vehicle. It appears most people are wiring it like LS1 Nova recommends. I've read other threads where people have "Stuck" an A/C Switch module, like the one that came from the donor vehicle, under the dash and run their new A/C system through the module and out to the PCM. This way it maintains the PCM control of the fans etc. Good luck and keep us posted.