Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
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It is likely your actuator defaulted to defrost or heat. You'll simply need to move the blend door into the correct position to match your new actuator, as the actuator was manufactured in a different position than your door is currently positioned in. The doors should move freely. I'll attach the actuator recalibration procedure.
Alternate Method (w/o Scan Tool)
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You can also slide the actuator onto the shaft loosely and then turn the whole actuator assembly for leverage to turn the door to line up the screws.
Let me know if you need further assistance. George