Auto Air Conditioning & Heater Repair: 2004 Silverado 2500 HD, wiring harness, refrigerant

Question
I have the manual temerture control and am looking to switch over to the digital one.  Manual has the black plug and the digital has a grey plug on it.  Is this plug on the harness some where?  I bought this a while back looking to switch out but now am having issues with ac and think this might be the place to start.  I jumped my truck recently and know the AC blowing semi cold out of three vents and very hot out of one vent.  think I might have done something to the control head as all my fuses are good.  I am looking for some direction on wiring this in and finding he proper plug.

Thank you
Daniel

Answer
Hi Daniel

Unfortunately GM only puts in one wiring harness so you must stick to the original.  Try and disconnect your battery and reset the system.  Your control is manual but it still activates actuator motors that may have  lost their way.  If that does not fix it check your pressures it is very common when your refrigerant is low for your vents to have different temperatures.  Good luck let me know.