Okay fols I need some help. My 05 silverado is giving me greif. It started with my dual zone heat ac controls notworking. no matter what temperature I set it for the drivers side gives heat. Passenger side works okay. I tried disconnecting the battery (overnight even). Then I replaced the control head itself and still the same thing. I'm told there is a sensor somewhere in the duct or it could be an actuator but I'm not sure where to start looking. I need to get this fixed.
Next once in a while when I turn my right turn signal on the hazard flashers (4 Ways) come on. The left turn signal works properly. Any ideas?

 

Okay I broke down and had the heater controls looked at. $534.00 later and a new blend door and the system works again.
As for the signal lights it seems there was a bit of a problem with the trailer wire harness in the back. I wiggled them and the problem went away. When it warms up I'll have to chase it down some more.