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Possible blockage in the rear air units expansion valve. I just replaced mine for the same reason.
take them out :)
To remove center air vent s a t20 tool is needed. Unscrew, climate control unit and compartment. After it is pulled away, their vents are exposed. To remove air vents unscrew bolts and pop out of place.
Your front blower motor has gone out. There is a front and a rear blower motor.
I believe the upper vents are for A/C only. The floor vents are for the Hot air. Test your ceiling controls by moving the knob from cold to hot, you should hear the air pass from upper vents to lower vents. Providing of course you have selected REAR from the front control panel.
check to see if the controls for the vents are working, there is ususally a vaccum control unit and it may mot be working on the rear vents. hope it helps. duboff
The blend door actuator may not be working.
Its a faulty rear control switch (a/c or heat) on the dashboard. It works by vacuum and when it doesn't work correctly it defaults the rear heat. I just had this repaired on my '98.
remove the drawer in the center console near the back seats and then remove the cover that has the two small air vents by pulling it towards the rear seats. Will be visible the stud bolt.
The HTR RR switch in a Kia Sedona determines which air vents the air is blown through from the rear heating. When it is pushed in, the lower vents blow hot air, and when it is not pushed, the roof vents blow cold air.
There is not a fuse that controls the air to your vents in your 2000 Toyota. The vents are controlled by blending doors. The doors open and close to direct air to the desired location.
prior out with a flat screw driver