SOURCE: 1995 explorer heater/ac blower motor
I would check to see if there is a short on the fan controller switch and the motor. sounds like a crossed wire, especially if it's ignoring your speed selection and running when the key is out. could be near the fuse box under the dash. the cig lighter circuit is live all the time as well as a couple others, it maybe crossing with it. I would pull the fuse panels assem down and check for crosses and shorts.
SOURCE: Heater blower won't turn off
most likely a blower resister which should be located under the passenger compartment
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