2004 Won't Blow Warm Air, Only Cold

[monaco]

Blower works, AC works, but it's blowing cold. There's no engine overheating issues. What's the issue with that? Air mix servo, thermostat, or something else?
2004 Sequoia.

Thanks!

 

[tbplus10]

Blend doors stuck or servo into, look under the dash while switching modes and see if things are moving.