This is a longshot, but I don't suppose I'm just missing the availability to read the evaporator temperature sensor am I? Do we not have access to this sensor value since it goes through the AC Control head instead of the ECM or TIPM?

I see we get AC Pressure, just not the evap temp. I'm about to have to pony up for someone to scantool me to diagnose these AC issues (ECM not commanding AC to engage).