90% of the time on those trucks, it's the motor assy itself. The spacer plate wears out and many funny things can happen. You could test it but the best way is just to change it and eliminate a common problem anyways. Motors range from $45 and up.
The temperature actuator motor controls the flow of air through the heater core. The motor is located under the driver's side dash, above the transmission tunnel. It's a little difficult to get to, but not bad. Check heatertreater.net for pictures and what to check for on the actuator motor.
Check fuse Check to see if you are getting power and ground to switch Check to see if you are getting power to motors - if so bad motor
Bad fan motor - Check to see if it is getting power Blown fuse Temperature sensor?
Assuming you have no speeds including HI I would check for power at the connection at the blower motor with ignition and switches on. If you have power the motor is shot. If you have no power go back and check the fuses. If the fuses are good check the switch and electrial plug at the switch for damage. If the blower motor speed resistor was burned out you would still have HI speed.
if the motor in the door isn't working try a rubber hammer at the bottom of the door where the motor is located, some times a jolt will get it working, if that don't do it check for power , if there is power then you will have to replace the motor. A lot of the time it is not the motor / window regulator itself but the little plastic regulator guide clips that break. I'd check this first because they are like $6 compared to over $100 for the full regulator motor. It is hard to find them for sale individually so I included some sources in the related links.
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i would check if you have power to the motor from the switch
The issue may be caused by a faulty blower motor resistor.
Could be bad switch? Bad motor? Broken wire in door hinge area Check to see if you are getting power to motor If you are motor is defective If not check out other mentioned areas
Try checking the blower motor fuse, it may be blown. Also, check the wiring harness for good contact to motor connection.Last, replace the blower motor , ~$30 and 20 minutes to replace it, watch for AC lines when working near them. Good luck!!
Blower motor not working? Bad fuse, relay or motor See if you are getting power to motor
It could be due to a blown fuse which can be found under the dashboard under the hood. If the fuse is fine, check the motor connection of the transfer case, and be sure it has not come loose.
First check fuses, relays to wiper motor. Then check power to wiper motor. Then check linkage to wiper motor.
Assuming they did not work with the old wiper motor, check the fuse, check the switch.
Start by checking the Audi's blower motor fuse. Check the blower switch, resister, and lastly, check the motor to find the problem.
If your motor is working you don't have to worry about the fuse. It has something to do w/the motor itself.
First check fuse,if good take door panel off the door that window is not working and check for power with test light at window motor while pressing window control switch,if power is present,than tap motor with hammer and see if brushes free up. If this will not fix it than you need to get new motor.