do you have auto A/C or manual?
manual will have a fan speed dial of 1-2-3-4.
auto, will have a button with "auto" on it.
here is a technical bullitin. if the system operates on high speed and there is no other speed, then the resistor is bad, it is recomended that you replace the blower motor along with the resistor.
Date:July 25, 2003
2002-2003 PATHFINDER; AUTO A/C HVAC FAN ONLY WORKS ON SPEED 4
This bulletin amends NTB03-057. This version contains updated Claims Information. Please discard all paper copies of the earlier bulletin.
APPLIED VEHICLES:2002 - 2003 Pathfinder (R50) with AUTO A/C ONLY *
APPLIED VIN(S):2002 Pathfinder - ALL 2003 Pathfinder 2WD - up to JN8DR09X*3W7103802003 Pathfinder 4WD - up to JN8DR09Y*3W829690
APPLIED DATE(S):2002 Pathfinder-ALL2003 Pathfinder-up to March 18, 2003
IF YOU CONFIRM:
The HVAC (blower) fan only works on speed 4 (high).
The vehicle is equipped with Automatic Air Conditioning (AUTO A/C).
Install the Kit listed in the Parts Information section of this bulletin.
IMPORTANT :The purpose of "ACTION" (above) is to give you a quick idea of the work you will be performing. You MUST closely follow the entire Service Procedure as it contains information that is essential to successfully completing this repair.
the reostat controls the lighting.
I am not so sure I know what your talking about.
Maybe you are speaking of the resistor in the bullitin? the resistor is what changes the fan speed by changing the resistance. that is what I am telling you is bad. what causes it to go bad is the blower motor itself. that is why I recomended this bullitin, it tells you all that.
can you point it out in the 1st picture. to pint it out in the picture, you can right click on the picture and save it to your desktop. then find the file, open it, then right click on the picture and click edit. then you can circle the part, then reload it up back on this page. to load it up on this page, look a the top of where you type me a message, there is a tree looking icon, click that then hit browse, you will have to find your edited file then re upload it here.
or maybe the 2nd picture is what your looking for.?