Replace fan resistor

Can you measure and VOLTAGE across the resistor?

Here is a GREAT Link (in my estimation):
How To Test The Blower Motor Resistor 2001 2004 Dakota Durango
Yes it's for a DURANGO but the process may help you!

Joe, have you seen THIS link?
2003 dodge dakota heater schematic Google Search

And THIS YOUTUBE?
Dodge Dakota Durango Blower Motor Resistor Wiring Diagram

Also there is this possibility:


That link is here (yes ~ again it's for a DURANGO, but the help may be here)!

Connector to blower resistor DodgeForum com

Anthony

Try to check the power and ground on the blower fan. If you missing the ground on the blower fan connector than most likely it is the blower fan resistor (controller), it is located under the hood close to back firewall behind left cylinder head.

i know you have replaced it you may have gotten a bad blower motor resistor.

I would replace the blower motor resistor first then see if that corrects this. The resistor is located next to the blower motor under the dash.

Check your blower motor resistor connection.Turn switch and fan on then wiggle the resistor pigtail fan should turn on if not replace resistor.These get to hot and usally melt the pigtail and loose their connection.

REPLACE BLOWER MOTOR RESISTOR. IF YOU GET ONLY ONE CONTROL SPEED.IF YOU HAVE ALREADY REPLACE BLOWER MOTOR RESISTOR.BLOWER MOTOR CONTROL SWITCH BAD. REASON BLOWER STAY ON ALL THE TIME.FAN BLOWER MOTOR RELAY BAD.
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If you have replaced the blower motor resistor block twice all ready, i would be replacing the blower motor itself. When the blower motor is drawing too much current it burns out resistors for lower fan speeds in resistor block, but doesnt blow fuse for fan. Also check for leaves and stuff in fan when removing fan.

It sounds like the fan control switch is faulty or that the connector on the rear of the switch is not making proper contact. It may also be the blower resistor but when any of the the resistors fail, you usually can still get high speed to operate. T o access the switch you will have to remove part of the dash front panel so that you can get to the rear of the switch to check the connector and remove / replace switch which is usually a snap in setup..
You could also check the resistor block for proper connection. The Blower Fan Resistor Block is usually located in the air ducting adjacent to the Blower Fan. The Resistor Block consists of 3 or 4 coils of special resistance wire attached to terminals which connect to the wiring that comes from the fan switch and then to the Blower Fan. The block is on the output side of the fan unit so that the airflow from the fan past the coils inside the duct assists in preventing them from overheating and burning out.
As you already have replaced the fan motor you will know where to look for the resistor block. To replace, remove the multi-pin connector and then undo the screws holding in the block. Check air duct for leaves and dirt which may have caused the coils to fail. Replacement is the reverse procedure

check the resistor first .

heres the electrical diag.....