So I bought two new AC Delco versions of this servo motor, one for my mode selection and the other for the temperature selection. I replaced the mode door actuator today (which is VERY easy) and there's still somewhat of a delay in mode selection, specifically when selection the forward (face) mode. It only seems to happen when needing to fully rotate the knob from defrost to face mode. When it happens I can here the little flap in the dash working. Is that normal? I followed the instructions and did NOT touch anything when replacing the unit and I also made sure the truck and controls were off. How hard is it to replace the other actuator behind the glove box? Thank you!