Dodge Repair: heating problem 92 dodge dakota, head gaskets, radiator fan

Question
A heating problem started back in april with our dodge 92 6 cyc. dakota. My husband found that a hairline leak was in the water pump. It was very small but it was squerting out. We replaced the water pump. It was still over heating. We could drive the dodge for about 8 miles and it ran great, but then it would get hot.  Three month later, here are the things that were done to our truck which we love. (The radiator was replaced one year ago.)
We changed the fan clutch which was orded new from dodge, the radiator/water pump was replaced twice, finally ending up with a new one that we ordered through dodge, the hoses were replaces, the thermostat was replaced 4 times, thinking that we might of purchases a bad one, there is no white smoke coming from the exhaust, the oil is clean, the heads were send out and checked and were okay,  the block was checked, and no damage, not even a hairline, it was in a repair shop,for 2 months, with mechanics that have been in the business for 25 years, they are baffled. They asked and called dodge repairs people for advice as to what could be the problem, they had used the internet for advice and they had sent the truck to other very experienced mechanics who have also been in the business for over 25 years.  All these people are baffled and have  never come across something like this.  It was flushed.  There is no radiator fan relay switch that is in this truck but they said that it didn't need one for this model and year. Please, please, please help us. I miss my truck and my children and I are having to spend our summer vacation at home.  

Answer
hello marliyn
this sounds like the water jackets are pluged it also sounds like a improper head gasket some on is not looking at the problem i would start with the water jackets first then replace the head gaskets this will cause this problem good luck to u hun and i will work on this with you u let me know u have a pretty name we will get u and your kids on a vaction . we will get that truck fixed one way or another