Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
The actuator is the motor that moves the air door. Once the old actuator is disconnected, the air door should move freely to accommodate the new cam/actuator unit. If it's not, then that was what caused the old actuator to go bad. Lube the air door hinge and work it with your hand until it is completely free and there is minimal to no effort required to move it; then, move the air door to a position where the new actuator can be installed.
Please let me know if you have any other questions or concerns.