Overheating Problem with the dreaded 4.7L
#11
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So the max cooling fan clutch from Mopar is overrated??? Is that just a ploy to get more money outta me? The pulley wiggles a little especially since I replaced the fan clutch. I am going back to the fan clutch because when the D was hot as hell on the highway the fan clutch still seemed to be moving at engine speed and when I stopped the fan still moved with some resistance. I thought when it was hot the coil would allow it to move more freely. Am i wrong about that and what about the code I am getting?
however if you checked the fan after it had been sitting overnight, chances are that the clutch was locked up, since all the fluid would have settled to the bottom of the clutch causing it to lock up until it gets spinning and moves the fluid around.
#13
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It should be farily straight forward. Pull the fan clutch off, anything that may be in the way of the pump, and pull the pump. I had a small hose that is a PITA to get to that goes from the water pump to intake manifold. If you have one on the 4.7 it's a good idea to replace it while you are there.
#14
#15
#16
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Yeah this is driving me crazy because I have replaced the fan clutch and the thermostat. I have not replaced the electric fan for the condenser which may be the problem. It does come on when I turn on the AC. It only overheats when I am driving on the highway and when it is hot outside. As I said when I was driving in Missouri in the cold last week the temp stayed at or below the 120 mark which is the mid point but when I crossed into to hot Texas it started getting really hot and over heating. I don't really know if I want to spend the money to change out the water pump and that not be it. ANY other suggestions you may have? Could the electric small fan be going out ?
#19
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It is supposed to come on with the a/c and when the truck gets to I believe 210 or 215. The thing is that after you get to 35 mph and above you have enough airflow over the radiator that the fans aren't really going to make a difference. How did the old coolant look when you drained it and did you have a 50/50 mixture of coolant going back into the D when you replaced the t-stat? I know these questions may sound dumb but I have to ask. Did you check for cold spots on the radiator yet? How did it look?
#20