2000 dodge durango cooling issue: I HAVE THE 5.2L 2WD. I have replaced the water pump, thermostat 3 times, hoses, fan clutch. To begin with ive had it tested at three places no one can figure out why exactly its over heating. so first recomended thermostat, then fan clutch and pulley tensioner and belt, so i did all that. Still overheated so changed thermo agian, now ive repaced the water pump and thermo 3rd time still slowly over heats, this whole time ive had good pressure and flow, o ya i als changed my radiator cap, ive also been told by my mechanic he did a pressure test for casket leaks but it checked out fine , theres no leaks anywhere no oil in my coolant and no coolant in my oil. he has also did the temp test on my radiator to see if there were any cool spots he saw nothing but a slightly by one or 2 degrees diffrence in the center of the radiator. he assumes it becuase of my elecrtic fan and the one on my pump are there