I'm on a roll here this morning with dumb questions so here's yet another. I am flushing my cooling system this morning. After flushing I started the engine up with only water in the system, heater in full position and fan on high. For the first 5-10 minutes I had no heat and a lot of water running out of the bottom of the heater core box at the firewall. The condensor (I think
that's what it is?) was condensing a lot of moisture on the outside. After the truck got up to temperature and the thermostat opened I started getting heat inside and the water stopped running out of the heater coil box.
Is this normal???

 

I had to read your post a few times to sort out what I think you are saying was leaking water.

I'm baseing the following on the assumption that it's rather humid in North Carolina right now, and that like a '97 and newer, ford wired '94's to run the AC compressor in the Heat possition too. Oh and that you have AC in your truck and it works too.

So if you water wasn't gushing out but only dribbling or maybe a little more.

Than I'd say it's normal condensation on the AC thingy. (I forget which is the condensor and which is the evaporator)

Hope that helps and it wasn't something else.

Doug

 

I think what I was calling the heater core box was actually the air unit. I got ahold of a diagram and the heater core is in under the cowl so the thing leaking must be the air unit.
The 94's must be wired as you said because when I run the heater on full and put the switch or defrost the a/c accumulator gets condensate on it. when it's on heat and the switch is on vent or floor there is no condensate.

 

the defroster uses the AC to remove the moisture from the air so the defrost will remove the condensation on the inside of the windows. it does this regardless of the temp control. this is why its called an Air Conditioner.