Any ideas on a likely culprit for losing my air conditioning and my heating and cooling controls on my 2012 Boss? My defroster and fan controls are inoperative as is the AC. The lights on the panel work but no air comes out of any of the vents. I went through the fuse blocks and tested everything related to the system with both a 12 volt test light and a multi meter. All fuses are good. I don't know how to test the relays... I'm zeroed in on the blower motor resistor but I don't know if that's correct or not. I have power to 2 of the 4 wires confirmed with the 12 volt test light. Anyone seen this arse ache before? Thanks all.