The rear temp blend door is stuck in the cold position ,very common problem on vehicles with rear HVAC units . There is no valve , electric actuator !
Air Temperature Actuator
The air temperature actuator is a 3 wire bi-directional electric motor. Ignition 3 voltage, ground and control circuits enable the actuator to operate. The control circuit uses a 0-12 volt linear-ramped signal to command the actuator movement. The 0 and 12 volt control values represent the opposite limits of the actuator range of motion. The values in between 0-12 volts correspond to the positions between the limits.
When the HVAC control module sets a commanded, or targeted, value, the control signal is set to a value between 0-12 volts. The actuator shaft rotates until the commanded position is reached. The module will maintain the control value until a new commanded value is needed.
You would need to remove the
Quarter Lower Rear Trim Panel
Remove the rear seats. Refer to Rear Seat Replacement in Seats.
Remove the back body pillar trim. Refer to Upper Rear Trim Finish Panel Replacement .
Remove the body side upper trim panel. Refer to Third Pillar Trim Replacement .
Remove the cup holder from the rear quarter trim.
Remove the rear accessory panel from the left side quarter panel. Refer to Rear Accessory Panel Replacement .
Remove the retainer bolt from the seat belt retractor. Refer to Rear Seat Belt Retractor Replacement in Seat Belts.
Remove the upper cargo net retainers. Refer to Cargo Net Replacement in Body Rear End.
Remove the liftgate sill plate. Refer to Liftgate Door Sill Plate Replacement .
Using J 38778 remove the rear quarter trim panel retainers.
Remove the rear quarter trim panel from the vehicle.
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