[Huney1]

I got'cha fine fordfool. Well, it sounds as if you've covered all the bases and surprisingly enough this is not the first time we have see your delima where you're about ready to throw up your hands and run screaming down the street. But don't abandon ship just yet because we have seen where they never ran hot but no heat and it ended up being the water pump blades worn down to nubs. Looking at them you'd think they were hardly capable of pumping any water a'tall, but apparently they pump enough to keep the engine cool, but not enough flow to push it through the heater core.

I wish I could tell you there was some way to test the water pump flow but with the age and miles on your Taurus about the only way to tell is pull the pump off and look at the blades. Take it to an auto parts store and ask to see a new/rebuilt pump and compare your blades to the new pump then you'll know for sure. I don't know about the 94's, but take the water hose off the pump and see if you can stick your fringer far enough in to feel the blades and compare them to a new pump and that way you don't have to take it off.

Only other thing I can come up with is if there's an air bubble in the heater core or you have the hoses to the heater core hooked up backwards.