Where is the blend door motor located. I know it is under the dash and what does it look like.

There are electric motors that move blend doors in your dash board. The blend doors control the heat/cool ratios as well as the location the air will blow from. It's very common for the doors to break or the motor to fail and require replacement which can be costly.

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There is blend door in vent channels under the dash of the vehicle. It blends warm and cool air in the vents depending on the temperature setting. The Blend Door is controlled by a motor called an actuator that gets its signals from the setting on the dash. When the actuator fails the blend door can't move. If it stops on hot you always get hot air.
3 possibilitys
1. Blend Door stuck.
2. Temperature control not sending signal to actuator.
3. Actuator motor gone bad.

Of the 3 possibilities the actuator motor is the most common and the easiest to fix. The part is $40-90. I don't know exactly where actuator is on the Pilot. My GMC you remove the plastic trim below the dash and its just to the left of the glove box near the 'hump'. Perhaps the part store can tell you or someone else will offer the exact location.

Once you remove the actuator you can plug it back in to the wire clip and move the temperature knob and see if it moves. When you get the new one plug it in and make sure it turns before bolting it in.

To clarify a bit. The heater is never technically turned off. The blend door determines how much it goes thru the vents.

On the motorcraft parts web site, you can blow up
a picture of the HVAC Blend Door Motors & locations,
as well as part numbers

You can get failed motor from Amazon

With knowing where the motors are located, try switching
the air flow modes manually, to see what positions do not work

Then you know what motors to replace

I also have professional scan tool software & can see the codes
for the motors in enhanced data.

The-- Vent Blend Doors-by name

Defrost-up top
Cabin -the vents as you say in the middle & on the sides
Floor
Recirculate-under the glove box
Blend Door -under the dash on your print

The blend door is under the dashboard where the air ducts are located for your AC.

There is a blend door that regulates where the air will come out of depending on where you set it on . Sometimes this blend door is operated on vacume from under the hood in the engine compartment if this vacume line breaks or is broken then you will have the problem you just described.Check for a broken vacume line. If the blend door is electrically operated check to see that you have voltage to the blend door motor if you have voltage then chances are the motor is bad and needs to be replaced also check the gears to the blend door most are plastic and some tend to strip. The blend door is located inside under the dash it may have a vacume line connected to it or a electrically operated motor but it should be located on the air duct some where you just have to look and know what your looking for. If you do locate it you can always move it manually with your hand to know that this is where the problem is at good luck and hope I helped you.

no u must remove the dash.

The problem is in the heater box. To be more specific, the blend door. Check blend door operation and blend door motor. Located right side under dash. Remove blend door motor, with vehicle running, move switch from panel to defog and see if blend door motor moves.

it can be found under the dash on the passenger side.

most likely needs a LH (bottom) temp actuator. Located in the center of the dash on the bottom, you have to remove the hush panel on the rh side of the truck

The heater and a/c blend door actuator motor is located behind the center of the dash just below the windshield. The steering column must be detached and lowered and the dash must be removed to access the blend door motor.