Another "no heat" problem

[leedo]

I know there are several threads on this, but of course, my problem seems a bit different.
I have a 2002 EB with the 4.0L V6 & the electronic dual climate control.
The heat is lukewarm at best, enough to keep the windows defrosted but not much else. It doesn't matter if it's defrost, floor or vent & both sides (drivers & passenger) are the same.
I've done the obvious, flushed the system, new control valve, thermostat, & coolant cap.
The truck runs normal temps according to the gauge & the coolant does get hot & I've checked for air pockets.
I found this thread; http://www.explorerforum.com/forums/showthread.php?t=330735 & the audio clip in post #2 is exactly what my blend doors sound like.
I also ran the diagnostic tests from this post; http://www.explorerforum.com/forums/showpost.php?p=2095985&postcount=81

and from the on demand test, (the first one from that post) got a display of 12-59 degree C. It had the little circle symbol after the 59; I assume that was for degrees?
Running the second for the continuous DTC's, I didn't get any errors.

Does anyone know what might be the problem or what that 12-59 C code is before I take this thing to the dealer?
I don't want to throw anymore $ at it until I have a good idea what's going on.

 

[Number4]

Flushing the system doesn't mean removing any blockages. If you aren't getting good heat coming out of any of the vents, then I can think of only two things.
1. There is a blockage in the heater core preventing the coolant from circulating through it.
2. The electronic temp control isn't interacting as it should with the doors and is blend too much 'fresh' air with the hot air.

 

[leedo]

I should have mentioned that I did flush the heater by itself as well with air. It semed like it did have good flow. I was wondering if anyone has ever had a water pump with bad/broken ipellers limiting the flow? The electronic module is something else I was wondering about. I have an appointment at the dealer Saturday so we'll see what they say.
Thanks for the reply!

 

[leedo]

Well the dealer says the heater core is plugged to the tune of $1300.
Are there any good guides for this? I saw some YouTube videos but they looked like they were for a second gen.
Maybe it's time for a different vehicle.

 

[Justme63]

I just noticed that I have very little heat and my temp gauge is reading higher that it should, water pump is my determination as to the cause. Good luck.