The squirrel cage attached to the blower motor cracked into several pieces and caused the motor to seize and burn. Replaced the blower motor and cage. New motor and cage are running but no air comes out of the top and and defroster vents when set to either position, When set to the floor position, a little air will flow.
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Which vents, floor--defrost--dash? Can you hear the blower motor running? The squirrel cage could have broken loose from blower motor? There could be an actuator problem under the dash? If actuators are vacuum controlled and vacuum is lost, it might default to defrost, only blow out defrost vents.
under the dash passenger side , you have to get upside down, be sure the squirrel cage is the same depth on the new piece as one to deep will bind up and could burn up the motor befor you figure out why it is not turning
This would suggest a bushing on the shaft of the blower motor is worn and causing the motor to have to pull too much current to run properly. You should replace the blower motor or recondition it so the squirrel cage or "fan" portion of the blower motor turns freely with no significant resistance.
It is very possible that the blower motor squirrel cage housing has leaves in it, they get in there from the air intake for the system at the base of the windshield. Remove the blower motor from the housing and clean out the leaves. These leaves also pose a fire hazard and I've seen that a few times, the heat source is the blower motor speed dropping resistor in the air duct near the blower motor squirrel cage housing, it can ignite the leaves, this can cause at the very least smoke coming out the vents, which can be a little exiting on the freeway.
More than likely the squirrel cage fan attached to the blower motor has broken or come apart causing it to bind up in the housing making the vehicle blow a fuse. Check the fuse block for the blown fuse then try the switch for the fan speed again if no noise, you may want to inspect the fan for damage.
If you can hit on the blower motor housing and the motor starts, your brushes on the motor are bad and the blower motor needs to be replaced. Used tested unit $30.00 at a junkyard. New rebuild $54.00.
Many posts have stated that the dash must be removed to replace the blower motor. It can be done without removing the dash. I know as I replaced the blower motor on my kids 99 Durango last night but it took about 4 hours. Now that I know how to do it, it would estimate 2 hours.
Remove glove box by opening glove box all the way. Press inward on the both sides of the glove box to allow the rubber stops to clear the catches and lower the box The two outer hinges (plastic) will come off by slightly twisting the glove box upward leaving only the center hinge (plastic) in place. Reach in and push down on the hinge to pull out glove box. Set aside.
Remove side trim panel by pulling back carpet and remove one Phillips screw. Remove panel by pulling back on upper portion to remove clip from frame, then slide forward to remove from lower plastic trim.
Use 1/4" nut driver or socket to remove two screws holding vacuum canister on lower right side of blower shroud. Remove two vacuum hoses noting which hose goes to which side of the vacuum canister (both were green in color on my Durango). Disconnect connecting rod from vacuum canister to vent control by removing lock washer (you may be able to get away with not removing the rod, but the plastic "fin" may break if you stress it while removing the blower shroud.
Use 5/16 nut drivers/sockets with extensions to remove the blower shroud hex bolts. The hex bolts are located in several areas around the shroud (use your finger to follow shroud edges to locate all 8). Some of the hex bolts are very tricky and may require odd positioning of your body to locate and remove them.. I also put several extensions to use in order to reach the various hex bolts. Once the hex bolts are removed, pull the plastic blower shroud down exposing the blower motor squirrel cage.
Remove two of three hex nuts holding blower motor in place. Loosen the third one and the blower motor should come free. I was not able to remove the squirrel cage from the old motor so I broke the squirrel cage allowing me to expose the wire harness and grommet that went through the back of the shroud.
Feeding the wire harness back through the assembled wall appeared to be a real challenge, so I cut the green and black wires at the motor for splicing into the new motor later. Remove the motor and broken squirrel cage and throw the dam thing away.
Remove squirrel cage from new motor by removing retention clip with a pliers. Pull off the squirrel cage carefully by applying WD40 (or other lubricant) to the shaft. You may have to place two large screw drivers or other pry bars underneath the squirrel cage equally across the underside of the squirrel cage slowly prying up the cage. I accomplished this with a helper to hold the motor in place to allow equal pressure from both pry bars.
Cut green and black wires on new motor leaving enough wire to work in the tight area of the motor housing. Strip wires from old harness and new motor and apply **** splices for green to green and black to black. Add electrical tape for extra mechanical strength and insulation.
Place new motor into housing and secure the three mounting hex nuts. Turn on key and run blower to make sure it works. Install squirrel cage and retaining clip on motor shaft. Run again to make sure it works.
Install the balance of the items in the reverse order you removed them.
Now on to replace the rear wiper motor on the same Durango. Junkyard parts $54.00. Time: Unknown?
if all you did was drop the blower motor and clean the squirrel cage out, the I would recheck for any vacume hose that might have got pulled off or broken that moves things like blend air door,are you getting air flow out from the motor to floor or defrost?
There could be a recirculation vent door,stuck,or the blower motor is bad.Hard to tell .Not being there it is hard to diagnose.But it does sound like both of these symptoms,so I know what to tell you .Maybe more information would help,I don`t know.Rmove the blower motor and inspect it for broken,or cracked fan cage(squirrel cage fan).Also check motor for abnormal play(side to side movement).Hook fan up to battery and see if it runs fast and not vibrating,or noisy.I hope I was some help,If I can help,let me know.