Under the passenger side dash/glovebox you will see a wiring harness/connector. It can be hard to see unless you lay on your back on the passenger floor. you will need a socket-and a flashlight/light of some kind. An extension for your socket wrench MAY help you get the right bolt out. If you are having trouble getting the left bolt out you may need to remove the front bolt from the plenum (the thing the air comes from when set to floor/feet). There is a pain in the butt bolt behind the plenum that you may need to loosen to get enough room to move the plenum out of the way. Carefully push the plenum to the front of the truck being careful to not break it! You just need enough room to get the resistor bolt out.
Once you fight with the wiring harness and get it disconnected READ THE RESISTOR INSTRUCTIONS! The new ones have extra tabs that MUST be cut off, if this is the case there will be an instruction sheet with the new resistor. I used a good pair of kitchen scissors.
Before installing the new one inspect the old one. If there is a burnt looking pin (usually #2-second pin from left-there should be numbers on both resistors) you will need to get a new wiring harness, unfortunately I can only find one at the dealer or a salvage/junk yard.
If everything looks good or you have now replaced the harness bolt in the new resistor then carefully pull the plenum back into place. It needs to fit correctly to work. There is a bit of flimsy foam that needs to be in the right place so it won't block airflow. If you accidentally ripped this off you can do 1 of 2 things.
1) use camper tape on the piece the plenum goes over. in other words the piece that is attached to the truck not the removable plenum. It will have to be thin camper tape
2) Duct Tape the outside of the plenum. there are other tapes you can use but you need to be able to remove the tape for future repairs.
It is under the hood in the passenger side firewall.
Under the dash, far passenger side.
Diagram for location of blower motor resistor can be found herehttp://autorepair.about.com/library/images/bl441a-lib.htm
replace the blower fan resistor and you`ll be okay
Under the dash below glove box. You will see the blower motor and it's to the left of it. You will see a wire harness going to it.
Your truck has both. the resistor is between the switch & blower.thje resistor controls the blower speed
most common problem is the blower resistor In the firewall on the passenger side of the truck is the blower motor speed resister coils, they burn out alot. I could not find one for my Dakota so I got one from a dodge caravan and I changed the wirring, that is the most likely problem
A 1998 Dakota does not have a ballast resistor.
check the blower motor resistor pack. should be firewall side of heater rectangular connector with 4 or 5 wires.
I have changed resistor a d blower motor still not working, maybe i missed a fuse or could the control switch not work?
The resistor just helps in the different speeds, and isn't used at all during hi speed, Access it under the passenger side of the dash.The resistor, and the blower motor are both easy to get to
For the 1989 Dodge Ram, the heater blower motor resistor can be found on the passenger's side, on the bottom of the heater box. It is beside the blower motor.