Blend door actuators

My issue(s):

I hear the pop or clicking in the dash occasionally when I first start the SUV.
The A/C works but the heater blows cold air out of the defrost, mid-dash and floor vents.
It seems the re-circulation mode does not work because I smell exhaust. I toggle that mode from external air to recirculated internal air and it does not seem like anything happens.

Do I have this right? Replace both the re-circulation actuator and the mode (defrost and mid vent and floor) actuator.
If so, are they both the same part?

And since I do not have dual climate control, then I will not need either temperature actuators, right?