I'm no expert, but my Jeep had fan problems. If it doesn't work at all, I would suggest tracking down the relay for it. If it only works on the highest fan speed, it's the resistor in the blower housing. My resistor has blown 3 times and now I've bent the thermal cut-off as far away from the resistor coils as possible so it won't get so hot. Hopefully someone with more knowledge will answer you.
Yeah,my ac wont work cuz of a relay behind the dash I cant get to.Keeps blowing fuses for the blower.Good luck!After trying to tear my dash apart thats usually an easy job on any other vehicle,the XJ is a special case
My fan on mine is tempermental too, sometimes it won't come on so I pop the hood and whack the fan housing with a screwdriver handle and it will kick on. Sounds like you have a similar problem, I would suggest replacing the fan motor(not that tough a job, really). I need to do mine but I am a major cheap skate. I'll wait to change mine when it craps out in -45*f.
Fan motor and fan $43.18 after tax and installed in car in one hour including trip to parts store and painting tray coolant bottle sits on. O'Reilly Auto Parts
You must cut old connector and attach to new motor, place new fan on new motor same depth as the one you are replacing. It really was easy.
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