Chrysler Repair: Defroster, heater blower resistor, electrical coils

Question
2002 Chrysler Sebring- Blower on defroster works
on highest setting but not on lower setting. Would
this be a fuse problem or a part in the blower. I don't have a manual so not sure what fuse it would be.

Answer
Hello J,
I don't have the wiring diagrams for the Sebring either, but based upon the Chrysler engineering patterns from earlier models this particular symptom is typically caused by a component called the 'heater blower resistor block' being faulty. The multispeed fan function is brought about by this block and when it fails the blower will only run at high speed. It is typically located high up on the firewall panel between the cabin and the fresh air intake plenum at the base of the windshield. (It is mounted there so as to dissipate the heat built up in the resistors when the motor is running at less than max speed) You might get a look at it by shining a flashlight into the passenger side far end of the air intake to look to see some electrical coils grouped together on the back wall of that plenum. Usually it is held in place by a couple of screws that are accessible from the cabin side, above the glove box. You usually have to remove the glove box from the dash panel to gain access to it and to its electrical plug. If you can see it from outside you might see whether the fasteners have 'heads' or alternatively look like the pointed ends of screws in order to tell which side you will need to approach it from for access to it for removal and replacement.
This suggestion is based on my having read wearing diagrams thru the '94 model year and assuming no change in the engineering of the blower motor control.
I am also assuming that the blower motor also won't function on anything but high when you are asking just for air to be distributed to the cabin and not on the windshield (defrost) because it should be similarly 'high speed only' in that situation if the resistor block is indeed defective.
Roland