Air only comes out front vents, mode will not switch to floor or defrost?

Okay. So, I have both hot and cold air blowing but it will only come out the vents in dash, I switch to defrost and nothing not even the slightest sound. I switch to floor and same thing, no action, no noise, nothing at all. I’m thinking it may be the Mode Door Actuator, also part 2 of a problem, when I change the temperature there is a Gawd awful plastic grinding noise coming from under passenger side dash, almost like the heater farts at me every time I change the temperature, so I’m thinking that this problem might be my blend door starting to strip because of the cheap plastic, but I could be wrong. Please let me know what you can to help, I really appreciate you guys, you all do a great job and are so knowledgeable!