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There is a front-rear blower motor relay control that is involved in the circuits. This control module could be the problem. The blowers bypass the resistors to run on high speed. You may have to get a repair manual with detailed wiring diagrams to trace the circuits.
> With the control set 1 2 3 4 it does blow any air, ? does NOT? A common problem with this control is the failure of a stepped resistor which causes only the highest speed to still function since this bypasses the resistor. Tracing the leads from the fan speed switch may help locate it.
Hi, the resistor is screwed to the side of the blower housing behind the glove box. See procedure below to replace the resistor. You don't have to complete all steps in the procedure. just work your way to the point that you can unscrew the resistor. Please let me know if you have questions, and thanks for using FixYa.
See Figures 2, 3 and 4
Disconnect the negative battery cable. If so equipped, disable the Supplemental Restraint System (SRS).
Remove the glove box.
Remove the glove box frame (lower support)
Fig. Fig. 2: Remove the glove box and frame
If not equipped with air conditioning:
Remove the three screws and remove the heater duct.
Remove the blower mounting nuts. Unplug the wiring from the blower motor, resistor and recirculation control motor, then remove the blower assembly.
If equipped with air conditioning:
Lift the carpet in the passenger compartment. Remove the side cover (kick panel).
Remove the control unit bracket nuts; unplug the five connectors and remove the control unit bracket.
Remove the retaining band, then remove the blower lower covers. Do not break the tabs on the lower covers.
Remove the retaining nuts and remove the blower assembly.
Fig. Fig. 3: Air conditioned models require the removal of the control unit. Handle it carefully
Sounds like a blower motor resistor that is malfunctioning. It will cause the fan motor to only turn on at one speed, and generally it will work on High only. Pretty comon on and older vehicle, and fairly inexpensive.
If you are looking for the fan blower resistor, it is located behind the glove box. No tools need to get to it and a nut driver to remove the 2 screws to replace it. A 20$ part. It has 2 sets of wires coming off of it. A do it yourself fix.