@Joseph Garcia beat me to it. There are 4 blend door actuators under there. Should be able to see resistor with glove box removal. Look for loose connections or any discolored connections. Sometimes, just unplugging and plugging back in can fix. Also, look for any connections that have pushed out of the harness where they are just touching end to end instead of a good male/female connection.
HI, you mentioned there are four blend door actuators , I only know of the one under the drivers side, the one under the passenger side and the one behind the center vent behind the dash. Where is the forth one and what does it do?
that might be the issue because I've checked all the ones I mentioned.