When you say AC fan motor, which fan are you talking about?
Have a radiator/condenser fan under the hood, or the blower motor located under the glove compartment. Also two different types of MVAC systems, are vehicles except the LTZ have a manual blower motor control, LTZ is automatic.
Recently had problems with my interior blower motor, for whatever reason the squirrel cage blower wheel started to rub against an upper plastic shroud, that sure made a racket. Out of warranty, so added some shims under the blower motor to give a mm more of clearance, quiet now. Also have the 2LT with a manual blower control.
What did this better Chevy dealer replace? Should have been given an invoice stating so.
Use to think automatic climate control was great, been driving these things since the 60's, just set the temperature you want and the system does the rest, but has all kinds of servo motors, computers, to change the mode doors, blend door, and blower motor speed. But if anything like the in-car, ambient, or solar sensors went bad, the system would go nuts and would either be baked alive or frozen to death. And very complicated to repair. No interest in the LTZ for this reason.
Still have ACC in my 88 Supra, can live with that, it has a manual over ride, so if it goes crazy, I have control. Really loved my 04 Cavalier MVAC system, one cable operated manual control for the blend door, changes the amount of heat you get, and another for the mode door, defrost, vents, lower settings. Even the dealer only charge 12 bucks for new cable controls and could be replaced in five minutes.
Not even sure about this 2LT I have, all those MVAC controls fire commands to the BCM, and use servo motors to change either the mode or blend doors. Not cheap and operate off of a mircrocontroller that has code stored in flashram. Even the blower motor is this way. That 04 Cavalier used a resistor block to change blower speeds. Cheap and easy to replace. Cruze uses BMC PWM to control the blower motor, doing this the hard expensive way. See that modules was over a hundred bucks, but did knock it down to around 60 bucks. That is a heck of a lot of money for a 17 cent power MOSFET transistor.
Then code stored in flashram.
Did have mode door problems with that Cavalier, couldn't turn the mode switch. Wasn't too bad, removed the upper dash, used screws, then a cover on the mode door, more screws. They expected the mode door weather strip to hold that was self adhesive, it fell off and jammed the door. Wasn't damaged, glue it back on and stuck an aluminum plate on top of it so it couldn't fall off.
If this happens to the Cruze would be a nightmare, no more screws, super easy to snap this panels on but a b!tch to remove them. And I feel is this door was jammed, would burn up that servo motor or even the BCM, more expense.
Why can't they do stuff the simple way? Can tell you, microcontroller is a lot cheaper than a 12 buck cable to manufacturer, but sure rob you to death for a replacement.