Hi"
It sounds like the blend air door actuator has failed. Here is a link that shows in general how one is replaced.
https://www.2carpros.com/articles/replace-blend-door-motor
Now, since you have a dual climate control unit, there are two actuators, one for the left (driver) and one for the right (passenger). Here are the directions for removal and replacement. Note that the directions indicate both sides. You'r concentration is on the right side.
The attached pics correlate with the directions.
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2012 Chrysler 300 RWD V6-3.6L
Blend Door Actuator - Removal
Vehicle Heating and Air Conditioning Air Door Actuator / Motor Service and Repair Removal and Replacement Blend Door Actuator - Removal
BLEND DOOR ACTUATOR - REMOVAL
REMOVAL
WARNING: Disable the airbag system before attempting any steering wheel, steering column, or instrument panel component diagnosis or service. Disconnect and isolate the negative battery (ground) cable, then wait two minutes for the airbag system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the airbag system. Failure to take the proper precautions may result in accidental airbag deployment and possible serious or fatal injury.
NOTE: The Dual Zone heating and A/C system has two blend door actuators, one for the driver side and one for the passenger side.
LEFT SIDE
pic 1
1. Disconnect and isolate the negative battery cable.
2. Remove the left side instrument panel silencer See: Dashboard / Instrument Panel > Removal and Replacement > Silencer Panel - Removal.
3. Remove the two screws (4) that secure the blend door actuator (12) to the left side of the HVAC air distribution housing (3).
4. Remove the blend door actuator from the air distribution housing and disconnect the HVAC wire harness connector (2) and remove the actuator from the vehicle.
RIGHT SIDE
pic 2
1. Disconnect and isolate the negative battery cable.
2. Remove the right side instrument panel silencer See: Dashboard / Instrument Panel > Removal and Replacement > Silencer Panel - Removal.
3. Remove the glove box and the glove box trim panel from the instrument panel See: Glove Compartment > Removal and Replacement > Instrument Panel Glove Box - Removal.
4. Remove the two screws (1) that secure the blend door actuator (4) to the right side of the HVAC air distribution housing (3).
5. Remove the blend door actuator from the air distribution housing and disconnect the HVAC wire harness connector (2) and remove the actuator from the vehicle.
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Installation
2012 Chrysler 300 RWD V6-3.6L
Blend Door Actuator - Installation
Vehicle Heating and Air Conditioning Air Door Actuator / Motor Service and Repair Removal and Replacement Blend Door Actuator - Installation
BLEND DOOR ACTUATOR - INSTALLATION
INSTALLATION
NOTE: The Dual Zone heating and A/C system has two blend door actuators, one for the driver side and one for the passenger side.
LEFT SIDE
pic 3
1. Position the blend door actuator (1) into the vehicle.
2. Install the blend door actuator onto the left side of the HVAC air distribution housing (4). If necessary, rotate the actuator slightly to align the splines on the actuator output shaft (2) with those on the blend door cam (3).
pic 4
3. Install the two screws (4) that secure the blend door actuator (1) to the air distribution housing (3). Tighten the screws to 2 Nm (17 in. lbs.).
4. Connect the HVAC wire harness connector (2) to the blend door actuator.
5. Install the left side instrument panel silencer See: Dashboard / Instrument Panel > Removal and Replacement > Silencer Panel - Installation.
6. Reconnect the negative battery cable.
7. Initiate the Actuator Calibration function using a scan tool See: A L L Diagnostic Trouble Codes ( DTC ) > Verification Tests > HVAC Verification Test.
RIGHT SIDE
pic 5
1. Position the blend door actuator (1) into the vehicle.
2. Install the blend door actuator onto the right side of the HVAC air distribution housing (2). If necessary, rotate the actuator slightly to align the splines on the actuator output shaft (3) with those on the blend door cam (4).
pic 6
3. Install the screws (1) that secure the blend door actuator (4) to the air distribution housing (3). Tighten the screws to 2 Nm (17 in. lbs.).
4. Connect the HVAC wire harness connector (2) to the blend door actuator.
5. Install the glove box trim panel and glove box See: Glove Compartment > Removal and Replacement > Instrument Panel Glove Box - Installation.
6. Install the right side instrument panel silencer See: Dashboard / Instrument Panel > Removal and Replacement > Silencer Panel - Installation.
7. Reconnect the negative battery cable.
8. Initiate the Actuator Calibration function using a scan tool See: A L L Diagnostic Trouble Codes ( DTC ) > Verification Tests > HVAC Verification Test.
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Let me know if this helps or if you have other questions.
Take care,
Joe
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Saturday, January 11th, 2020 AT 6:45 PM