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Nov 14, 2012 - Uploaded by Freedomautomotive1
1998 ATC Jeep Grand Cherokee Blower Resistor connector Repair Kit (RARE 1/2 Year) ... How to Fix a Chrysler Blower FanThat Only Works on High - Duration: 16:51. ... JEEP2001 FIXING THE HEATER BLOWER CONTROL. ... Jeep Grand CherokeeCenter and Lower Dash Removal - Auto Repair Series ...
Your heater core is in your dash, and yes, its a pain to get to. My dad and I did my grandma's in the same minivan, and we ended up taking out the front seat just to give us extra work room. Usually if your heater core is bad, you will have a big wetspot in the passenger side floor board. The only thing that really can go wrong with a heater core is it leaks, thus the wet spot.
ok the is a sensor that leads to the fan this should be the problem to your fan not working. lol i remember one guy used a light switch wired to the fan sticking out of his dash. the problem is an easy fix :)
Its not the switch or the controller in the instrument cluster. On my jeep there was a panel on the passenger side under the dash board. It helped me find it by turning on the heater and going toward the sound of the blower. On the backside of the panel was a series of little coils that control the different speeds. one of those coils had been broken.
I have completely removed the dash out of a truck like yours, and most likely the trace of oil on the driver's mat is residual oil from perhaps the brake pedal or clutch pedal linkage (if it is a manual transmission). The blower assembly is mostly on the passenger side, and if the heater core failed ( the reason I removed my dash), then you should see coolant residue, not oil.
Your blower not working could be a bad blower motor, a fuse , the blower control switch, or the resistor assembly.
Hope you find your fix...
There are two possible problems with it. The first is the switch, and the second is the heater motor itsself. Since the switch is easier and cheaper, I would start there. You'll have to pull off the trim ring on the dash...chevrolet likes to put a border like thing around the dash components that just snaps in in order to hide the gaps and screws. Once this is out, you will be able to access the screws for the panel that contains the switch. Then it'll be a matter of simply removing the switch, and replacing it. If that doesn't fix it, then you will have to replace the fan motor. It's possible that the brushes inside are worn out from use by now, due to age of the vehicle, causing intermittent operation. Good luck, and hope you get it fixed quickly.
check the switch to be sure there is power goin to it and out of it. there is a high speed fan relay that usually controls all speeds. it will be under dash on right side probably on ac/heater box when u find it inspect wiring and connector