It could be a blend door actuator, you may want to see if you can hear it try to move when you change the blend settings. I'm not sure if that system works off of vacuum at all; if it does, check for a broken or possibly a disconnected vacuum line along the firewall or under the dash. Hope this helps you out.
Dual climate control problem
Does any one know why only cold air blows out passenger side when I try using the heater. Heat works on driver side. It's an 06 4x4 ? Also noticed vents won't switch to defrost from face. Any help on either issue would be great!
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