I think this may be the heater/AC air temperature control blend door actuator motor gears slipping over teeth, this is due to a sticking blend door that is hard for the electric motor to move due to heat warping. Remove the dash and replace them is my advice.
Answers & Comments
I think this may be the heater/AC air temperature control blend door actuator motor gears slipping over teeth, this is due to a sticking blend door that is hard for the electric motor to move due to heat warping. Remove the dash and replace them is my advice.