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Q: the heater stays on after u turn the truck off can it be multifunction switch on 1998 Ford F-150

I am having trouble with things cutting in and out the wipers, windows, inside lights and now the heater is staying on after I turn the truck off. I was told it was the ignition lock cylinder by some people I went to get one and was told the ignition lock cylinder would not cause it that it would be the multifunction switch witch one is the most likely problem
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Possible ignition SWITCH (not lock cyl.) problem. But the inside light thing dont jive with that, so check out answer1.
Any problems with the way it runs?
A short to power concern. the multi-function switch will not affect the heater or blower motor in any way,nor the windows. The one problem that I have seen ALOT of is a faulty windshield seal on the driver's side causing water to leak down the a-pillar and down into the central junction (fuse) box under the driver's side of the dash,causing various short to power concerns.I usually remove the 2 connectors on the rear of it,you'll have to get a 10mm shallow socket and 1/4 ratchet to remove these connectors,then get a mirror and look into the area where they plug into and you'll probably see water or corrosion.
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