Not much heat coming out of my 2000 expedition
Same thing happened to me, turned out to be my blower motor.
put fresh coolant...recommend an arctic type at this time of year and a NEW thermostat that opens at 195-200 degrees...check the wobble in the waterpump and the weep hole at the bottom for drips~ ....next would look at the control flap for the heater core flow~...sometimes they get bent and rusted~
of course the blower, resistor pack and switch....check them things too~
you may as well change the cabin filter while you're up in there~ https://www.google.com/#q=2000+expedition+cabin+air+filter&tbm=shop
I didn't see it mentioned, but it could be that your heater core is stopped up and needs to be flushed or replaced.
good catch ole-timer~ back at the shop we had a 1/2 nipple what had a shroeder valve in the middle of it, connect one end to the garden hose the other ends to the ...wish I could find a consumer-level equivalent of this...western tool....NO, McMaster-Carr....NO, Grainger....NO....such a simple goodie ya gotta make your own tho-
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