Rear AC Blows warm, heat only works on some settings

[Disneymama]

I’ve got a 2017 Expedition. Several months ago the front blower went out. It would only work periodically. We had it fished and no longer have issues.

Now the back air stopped cooperating. AC blows warm and the heater doesn’t work on all speeds. It’s making a noise but I can’t describe it exactly. Had a video but I can’t figure out how to post it.

Do the Expeditions have a lot of AC issues? I was leaning toward blend door but now maybe think it’s the resistor? I’m pretty sure I’d be able to fix either of those myself but not sure about anything else.

Have a daughter allergic to heat so AC in Texas is necessary. Don’t have a ton of money to have it looked at. I’d rather see if I can fix it before I take it somewhere.

Any ideas?

 

[papaweely]

My 2012 XLT makes a popping sound. Seems to be a common issue; https://www.youtube.com/watch?v=E-WN1p8sWeg

 

[Trainmaster]

If the gears in the blend door motor are stripped, it generally goes tick-tick-tick-tick... I know the XLT's have a rear blower resistor, not sure of the Limiteds. The controller in the ATC models is also electronic and plays a part in selecting the fan speed.