Driver side air will only blow heat.

ID Status Date Year Make Model Transmission Type A/C Controls Public/Private
#14269 Closed 2003 GMC Sierra public

Driver side will only blow hot air.
Passenger side will blow hot air and A/C.
Fan speed is functioning.

Fuses checked
30A HTR/AC – good
10A HVAC 1 – good
10A HVAC/ECAS – good


Most likely the actuator is faulty and will need to be replaced.  You could try a recalibration just in case battery power has been lost in the recent past.

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