It depends which one you have to replace. But for the floor motor I don't think much. I bought 4 actuators last year but didn't need to replace them as I found out what my issue was with my a/c. All the actuators have different part numbers so go to realoem to figure out which one you need to get if you find it's faulty

 

I had no heat at all from any vent, I replaced Aux water pump and heater control valve. Now the heat will run you out of the car.