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HEAT! Hope this helps as I just got done doing this repair. First, turn key to "run", turn on heater and fan and then pop hood. Go out and try wiggling the connector at the fan motor. I had poor contact here and found that problem was with the worn out brushes in the fan motor. Those two...

jim, I agree about a real world fix being needed, but after replacing both ends(male and female) with Ford OEM's I was a little disgusted. I rethought your advice and will install an aftermarket sealed plug next. One thing I should mention is that after replacement, I did see the heat problem...

:hammer: I discovered that the plug leading into the heater box(under the hood) had a loose connection. If I push it toward the right side(passenger) the fan picks up rpm's to the point where I think we will achieve liftoff.If I let it return to natural position, 1/2 speed returns. I didn't...

Your squealing heater :hammer: Typically, the squealing comes from a bearing on the heater fan motor. Usually the problem is worse when cold than warm.Three things you can do:Change out the fan motor completely,Change out the bearings, or dissasseble,clean and lube with white lithium grease...