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Did you carefully clean out all the debris from the heater box? Did your new blower come with a new fan unit, or re-use the old one? Can you hear the motor run but not blow? These fans are fragile when old, and sometime break right where they attach, thus no blow. If not running, check for current at motor, then resistor, then fuse. Only thing left is the switch.
remove the plastic panel underneath the passenger side dashboard area. This panel contains built-in retaining clips and simply pops off by hand.
remove three 8mm holding the blower motors assembly into the dashboard HVAC unit, use a 1/4-inch ratchet and an 8 mm socket. Remove the blower motor's electrical connector and discard the old blower motor. Install the new blower motor in the HVAC cavity and replace the 8 mm mounting nuts. Reconnect the blower motor's electrical connector and replace the plastic panel. Turn on the ignition and test the blower motor on all of the fan speed settings
This problem is caused by a defective blower motor speed control module aka blower motor resistor. The blower motor resistor is right under the passenger side glove box, next to the blower. You need to unscrew two box screws to dismount the right hand insulation panel, then you will see the resistor pad - little bit inside up. Unscrew two box screws then the pad will come off, unplug the power from blower motor and the seven pin plug from resistor pad. Installation reverse way
Hit the blower motor with a hammer handle and see if it starts, if it does replace the blower motor, if it doesn't replace the blower motor resistor located next to the blower motor in the air ducting with the connector sticking out of the air ducting
"I checked all the fuses.." There is only one fuse, the 20A WIPER one in the instrument panel fuse panel which energizes the blower motor relay. The panel also contains the BLOWER circuit breaker which supplies power to the relay. If these parts check OK, there will be 12 volts on terminal 87 of the relay with the engine running and 12 volts on the BLU wire connected to the blower motor. If you set the function selector switch to any position other than OFF, the blower motor should operate at a speed you select by rotating the blower switch. If this doesn't happen, rotate the blower switch to HIGH. If still nothing, the thermal limiter in the blower motor resistor may be open. If still nothing, the function selector switch, the blower switch, the resistor or even the blower motor itself could be defective
This is caused by a defective blower fan motor, replace it. Removing the Blower Motor
4Remove all four of the screws from the glove box with your Philips screwdriver and set them aside.
5Slowly remove the glove box from the dashboard. Make sure that no wires get caught or stuck. Place the glove box and its screws to the side of your work area so that they're out of the way.
6Locate the blower motor under the dashboard. It will be shaped like a small circle, and is about as big as a saucer used to hold a teacup.
7Unplug the wiring harness from the blower motor. Use the painter's tape to mark the wire, then temporarily tuck it out of the way under the dashboard.
8Remove the three screws that hold the blower motor in place.
9Carefully remove the old blower motor and place it to the side of your work area.
Installing the Blower Motor
10Inspect the new blower motor to make sure that it isn't damaged. Check both blower motors side by side to also make sure that they are identical parts. Place the new blower motor back into the same exact position as the old one. Make sure that all three of the screw holes line up correctly with the new blower motor's screw holes.
11Secure the blower motor by returning all three screws using your Philips screwdriver. Be careful not to strip the screws. One quarter turn past hand-tight will be enough to secure the blower motor.
12Remove the painter's tape from the wiring harness and plug it back into the new blower motor.
13Carefully slide the glove box back into position while making sure no other wires are caught or tangled, and resecure it with its screws.
14Remove the black tape from the battery cable's metal terminal and reattach the cable to the car battery. Start your car and test out the new blower motor on all of its air settings to make sure it works properly.
Either the blower motor relay is stuck closed and running all the time.Relay should be under the hood. Look in the owners manual for the location. Also does it shut off with key or continue to run, Most likely a stuck blower motor relay.
It is located under the right side off the dash. Remove the plastic kick panel and you will see it. The screws to remove the panel are just under the glove box. Once the panel is removed you will see the motor housing it has an electric plug with three wires.
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?