I had the same problem with my 2000 Jeep Grand Cherokee. After checking the conventional relays and fuses, we found an additional auxiliary cooling fan relay behind the front bumper. Once replaced, all is well. I wish you good luck!
There are several reasons that the fan relay
would be on, one is that the relay contacts are welded together, take
one of the other relays that are identical to the one you pulled and
plug it into the fan relay slot. If the fan does not come on you need to
replace the relay. The fan relay is likely shorted and keeping
the fan motor energized. To
check this you can remove the relays from the fuse panel. Remove
the cooling fan rely from the underhood PDC. Check position 10,
40AMP...
The relay should not be able to
be
turned on electrically when you have the ignition switch in the off
position. You may have a bad ignition switch, if so there are other
circuits that are on and your battery will still be drained.
Let
me know if the fan turns off with the relay unplugged and if after
changing the relay the fan stays off; as it may not be the relay, swap
another relay
into its slot and see if the fan starts again, if it does there is
another problem than the relay, if it does not you can get a replacement
at your local autoparts store. They will help you get the correct one.
Your Jeep is OK to drive as it has an engine driven fan just don't use
the AC if you can until the relay is replaced if that is what it turns
out to be.
Hope help with this (remember rated).
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