Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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With two different issues here (defrost not working and passenger side isnt working) most likely this isnt an actuator fault on the heater box as this would be two different actuators at fault in most cases if this was the cause here.It is rare to have two actuators fail at the same time.
What can cause this though is the heater/ac control on the dash itself needing replaced.In some cases the actuators can be calibrated using either a dealers TECH 2 scan tool or another scan tool that can plug into your vehicle and perform this function here.I would have a shop or dealer try to calibrate the actuators to see if this corrects the fault.If this does not correct this issue here then I suspect the control unit on the dash needs replaced.
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