My 2005 armada se blower blows all the time in the back ceiling. It is a little quieter when cold and hot adjustment knob is in the center. Any other time it blows at full force even with all other knobs turned off.
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Your van apparently has dual heat and air and it sounds as if your rear unit is working and your front is not. Will the front blow at any speed? or is it completely dead? If it will only operate on a medium setting you should have your blower resistor changed out, but if it does not operate at all, check for voltage at the blower motor plug in. If you have power but the motor is not running then have the blower motor changed.
Sounds like your blower motor when out, check voltage at the blower motor connector under the dash passenger side under dash, with key and blower on, if you have voltage blower motor out, also tap on it some time it will turn it on, but if it happens again you will have to replace it.
check fuses and relays. there is an electric motor that opens and closes a "blend air door' that switches from hot to cold. the other lights may or may not be related. Is is very possible that the plug going into the control unit has a bad connection.
You have a broken wire connection between the temperature control knob and the circuit board behind the center dash console. Vibration causes the failure and once the control knob gets loose the solder connection fails.
For someone that knows how to remove the dash unit and can re-solder a couple of new wires this fix should take no more than 1 hour. Make sure that you apply loctite to the heat control knob spindle nut when you re-assemble it.
The dealer quoted me 750 dollars to fix this issue and I found out that it's a common failure for this year. I fixed mine virtually for free but it took some tools and about an hour of my time.