How do I get the truck to start now? Could I have shorted something out by messing with blend door actuator?

1. Locate the blend door actuator. The actuator is located behind the dashboard, usually on the passenger side. It is a small, rectangular motor with a wiring harness and a linkage arm.
2. Disconnect the battery. Before beginning any work on the electrical system, disconnect the battery to avoid any electrical shorts or other accidents.
3. Remove the dashboard panel. In order to access the blend door actuator, the dashboard panel may need to be removed. Consult the vehicle's repair manual for specific instructions on how to remove the panel.
4. Remove the old blend door actuator. Disconnect the wiring harness and the linkage arm from the old blend door actuator. Remove any mounting screws or bolts that secure the actuator to the dashboard.
5. Install the new blend door actuator. Install the new blend door actuator in the same location as the old actuator. Secure the actuator with any mounting screws or bolts. Connect the wiring harness and the linkage arm to the new actuator.

Blend door likely stuck or the actuator broke.
Look under the dash first move your temperature from hot to cold and see if you see something moving if not Remove your glove compartment (usually only 4 screws) and look to the left side for something moving and if you do is still attached to a rod which would move the blend door.
Some cars you can't see the actuator at all, which means you have to remove the dashboard, not a job for someone that doesn't know what he / she is doing.
A mechanic fix cost anywhere from $400 to $900.

02 Ford Explorer Heat Blend Door Actuator Simple Fix - No ...

? 3:17
www.youtube.com/watch?v=uvuPzf0wjEg
Apr 28, 2012 - Uploaded by broomballusba12 02 Ford Explorer Heat Blend Door Actuator Simple Fix - No Tools Needed ... I will be making a few new videos shortly on the Ford Explorer, The Ford Expedition, .... This does Not Work on a 2002Ford Explorer Eddie Bauer.

Hi,
This may be similar to what I just fixed on an '00 dodge:
http://www.dodgeintrepid.net/showthread.php?t=89711

Accessing the Integrated Diagnostic System:

Procedure for Automatic Temp Control (ATC) equipped vehicles:

With the engine ON and the vehicle stopped set the temp to 75*F. Next hold down the Floor, Mix and Defrost buttons until the ATC display begins to flash. While the display is flashing, the system will run it's tests and calibrations.

When the display stops flashing, the tests and calibrations are complete.

The ATC display can only display one error code at a time. Any stored codes can be scrolled through by pressing the Panel mode button once for each code. DO NOT press any other button or you will have to start the test over. Note the codes and refer to the list below to determine what system is malfunctioning.

List of Climate Control DTCs:
23: Blend door actuator feedback failure (bad servo)
24: Mode door actuator feedback failure (bad servo)
25: Ambient temp sensor failure
26: ATC In Car thermister failure (ATC only, bad ATC head or ATC head disconnected while battery is connected)
27: ATC in car sensor failure (ATC only)
31: Recirculation door actuator stalled (stuck door or bad servo)
32: Blend door actuator stall failure (stuck door or bad servo)
33: Mode door actuator stall failure (stuck door or bad servo)
34: Engine temperature message not received (ATC only, bad ATC head or bus failure)
35: Evaporator sensor failure
36: ATC control communication failure (bad ATC head or bus failure)
37: Blend door actuator output shorted to battery (bad servo or wiring fault)
38: Blend door actuator output shorted to ground (bad servo or wiring fault)
39: Mode door actuator output shorted to battery (bad servo or wiring fault)
40: Mode door actuator output shorted to ground (bad servo or wiring fault)
41: Recirculation door actuator output shorted to battery (bad servo or wiring fault)
42: Recirculation door actuator output shorted to ground (bad servo or wiring fault)
43: Common door shorted to battery (probable wiring fault, could be a servo that failed in an odd manner)
44: Common door shorted to ground (probable wiring fault, could be a servo that failed in an odd manner)
45: A/C control blend door input open or shorted with respect to ground (MTC only, wiring fault or bad servo)
46: A/C control blend door shorted to battery (MTC only, wiring fault or bad servo)
47: A/C switch failure (MTC only)
48: A/C control mode door input shorted to ground (MTC only, wiring fault or bad servo)
49: A/C control mode door input shorted to battery (MTC only, wiring fault or bad servo)
50: A/C control electric backlite (EBL) switch fails (MTC only)

51: System voltage too low for calibration!!! (check battery cables, battery and alternator!)

Hopefully it's the switch behind the dash. I would try replacing your selector switch before messing with the blend door. You have to pull the dash out to access the blend door

Yes the fix is to remove the dash from the car and replace the blend door and the blend door actuator.

Looks like it sits on top of the heater housing left of the blower. You may be able to see it by removing the glove box. These things tend to strip their plastic gears. If you heard a lot of clicking before it failed, that is what happened.

Did you flush the coolant with a kit? Did you back flow the coolant? And one more question. Did you flush it with water hose or something with more pressure?

I would look at the air blend doors first, it sound like they are not working or your control in the dash is not working send a signal to them. they work by changing the air from hot to cold or in between.

Avalanche, Sierra And Silverado

1. Remove the floor air outlet duct extension (1) from the floor duct (2). Remove the floor air outlet duct extension (1) from the floor duct (2)
2. Disconnect the electrical connection at the blend door actuator (10). Blend door actuator and related components
3. Remove the blend door actuator mounting screws from the HVAC module.
4. Remove the blend door actuator as an assembly with the actuator cam. Remove the blend door actuator mounting screws from the HVAC module

To install:

1. Install the blend door actuator as an assembly with the actuator cam.
   1. Line up the heater/defroster valve lever with the blend door actuator cam slot.
   2. Line up the A/C valve lever with the blend door actuator cam
2. Install the blend door actuator mounting screw to the HVAC module.
   1. Tighten the blend door actuator mounting screw to 14 inch lbs. (1.6 Nm).
3. Connect the electrical connection at the blend door actuator (10). Blend door actuator and related components
4. Install the floor air outlet duct extension (1) to the floor air duct (2).

C/K Series

1. Disconnect the electrical connector to the mode actuator that is located on the left side of the air distribution case.
2. Remove the screws.
3. Remove the adjuster links from the control lever.
4. Remove the mode actuator.
5. Adjust the mode actuator by completing the following steps:
   1. Connect the electrical connector to the actuator.
   2. Turn the ignition switch to the RUN position. Allow the self-positioning of the actuator.
   3. Turn the ignition switch to the OFF position.
   4. Remove the actuator from the electrical connection. Blend door actuator-C/K Series

To install:

1. Install the mode actuator.
2. Install the screws.
3. Install the adjuster links to the control lever.
4. Connect the electrical connector.
5. Test the circuit operation