Passenger A/C not as cold as driver side

Welcome to 2CarPros.

Since the air temperature actuator is working on both sides, what I need you to do is calibrate them. Here are the directions. I omitted the first 6 steps because they discuss removal and replacement of the actuator. You only need the calibration info. You will need to remove fuse 15 in the under hood smart junction box. I attached a picture of the box and what fuse 15 is for.

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7. NOTE: The purpose of the module actuator position calibration is to allow the HVAC module to reinitialize and calibrate the actuator stop points. To carry out calibration, carry out the following steps.

Remove the Smart Junction Box (SJB) fuse 15 for at least one minute.

8. NOTE: When the ignition switch is switched to the ON position, the HVAC module will initialize and calibrate the actuators. Calibration of the actuators will take approximately 30 seconds.

Reinstall SJB (Smart Junction Box) fuse 15. Turn the ignition switch to the ON position and wait 30 seconds before verifying function.
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Let me know if this helps. If it doesn't, you may need to replace the blend air door actuator on the right side.

Take care,
Joe

Welcome back:

You know, just about anything is possible with all of the things they stuff into these vehicles anymore. Also, you are correct about location. If you want to remove it to inspect, here are the directions for the RH actuator. The attached pictures correlate with the directions.

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Removal and Installation

1. Remove the passenger air bag module.

2. Disconnect the RH temperature blend door actuator electrical connector.

3. Remove the 2 RH temperature blend door actuator bracket screws.

4. Detach the wire harness from the RH temperature blend door actuator bracket.

5. Remove the RH temperature blend door actuator.

6. To install, reverse the removal procedure.

7. NOTE: The purpose of the module actuator position calibration is to allow the HVAC module to reinitialize and calibrate the actuator stop points. To carry out calibration, carry out the following steps.

Remove the Smart Junction Box (SJB) fuse 15 for at least one minute.

8. NOTE: When the ignition switch is switched to the ON position, the HVAC module will initialize and calibrate the actuators. Calibration of the actuators will take approximately 30 seconds.

Reinstall SJB (Smart Junction Box) fuse 15. Turn the ignition switch to the ON position and wait 30 seconds before verifying correct DEFROST/PANEL/FLOOR operation.

Let me know what you find.

Joe

Welcome back:

Here are the directions. The attached pictures correlate with these directions.

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PASSENGER AIRBAG
Passenger Airbag

NOTE: Fusion shown, MKZ similar.

Picture 1

Picture 2

Removal
WARNING: Always carry a live airbag with the deployment door, trim cover or tear seam pointed away from the body. Do not place a live airbag down with the deployment door, trim cover or tear seam facing down. Failure to follow these instructions may result in serious personal injury in the event of an accidental deployment.
WARNING: Never probe the electrical connectors on airbag, Safety Canopy or side air curtain assemblies. Failure to follow this instruction may result in the accidental deployment of these assemblies, which increases the risk of serious personal injury or death.
NOTE: The air bag warning indicator illuminates when the correct Restraints Control Module (RCM) fuse is removed and the ignition is ON.
NOTE: The Supplemental Restraint System (SRS) must be fully operational and free of faults before releasing the vehicle to the customer.

1. Remove the instrument panel.

2. Remove the RH instrument panel register.

3. Remove the screw and RH ventilation duct.

4. Remove the screw and RH defroster duct.

5. NOTICE: Do not pull the electrical connectors out by the Connector Position Assurance (CPA) clip. DTCs can be set in the Restraints Control Module (RCM).
Using an appropriate tool, lift up and release the Connector Position Assurance (CPA) clips and disconnect the passenger air bag module electrical connectors.

Picture 3

6. Remove the 4 passenger air bag module-to-deployment chute bolts.

7. Remove the passenger air bag module from the deployment chute.

8. Remove the 2 bolts and passenger air bag module bracket.

Installation

1. Install the passenger air bag module in the instrument panel.

2. Install the 4 passenger air bag module-to-deployment chute bolts.
- Tighten to 9 Nm (80 lb-in).

3. Install the passenger air bag module bracket and 2 bolts.
- Tighten to 9 Nm (80 lb-in).

4. NOTICE: The Connector Position Assurance (CPA) clip must be in the released position before installing the connector. Failure to have the CPA (Connector Position Assurance) clip in the released position may break the tabs causing Diagnostic Trouble Codes (DTCs) to set in the Restraints Control Module (RCM).

Connect the passenger air bag module electrical connectors.

- Lift up the CPA (Connector Position Assurance) clip and install the electrical connector fully and lock the clip.

Picture 4

5. Install the RH instrument panel register.

6. Install the RH defroster duct and screw.

7. Install the RH ventilation duct and screw.

8. Install the instrument panel.

Let me know if this helps.

Take care,
Joe

Welcome back:

Calibration would make sense, but if it's done, it should be fine. The only other things I can think of is if the blend door is hanging up a bit or if the actuator is faulty.

I wish I had a better answer, but it has to be one of them unless the duct work is leaking somewhere and allowing air to be drawn into the system.

Let me know what you find.

Joe

Welcome back:

When you close the one vent, it increases the pressure to the other side. Are you sure that isn't what is happening? In and of itself, that shouldn't make a temperature difference.

Let me know.

Joe