My plan was to do both at once, but I just dumped $1200 in timing chain parts to do that repair for the rattle on startup! God I hope there is light at the end of the tunnel once I get over these isssues with the truck. Shame Ford didn't spec them properly.Tough call. I did both the radiator and intercooler at the same time so I can't give you any data on just replacing one or the other. I mentioned it was easy doing both at the same time but it really wasn't any different if you did one and then later did the other. The intercooler is a much easier install if that makes any difference. I'll update after this summer when I've really been able to test once outside temp is above 90. I however am one of those leaning towards the radiator making the bigger difference but maybe you're on to something on how quickly the motor cools down once you let off. Mine did that as well. If water temp really was that hot it wouldn't cool down that fast but air would.
If you're convinced it's both then you might just need to bite the bullet and throw some money at it like I did. I almost exclusively use this truck for towing and it's been great except for the occasional over heating. Hope that's gone now.
I've never seen the trans temp climb even when engine was really hot. Couple times engine temp would climb super fast and I would get the dash notification reducing power to cool down or whatever it says before I had a chance to let off on my own.
Although if you are towing a lot of weight, you'll most likely have to pull over. I tried pushing my truck through this once it reduced power and it eventually just quit on me. I was towing and was forced to get a tow to a dealership with my rig. Not a happy camper.No, it's the way the truck is programmed to keep from damaging components.
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Fighting simlar issues with my truck. I've got a thread over in the Towing section talking about the Radiator fans contribution to the problem. They play a key role as the fans control how much airflow & cooling can be provided by the radiator.I am still on the fence about what order to buy things. It seems there is no one item that will "prevent" overheating. But if I get what you're saying, the radiator had the most impact in keeping your temps down. It will not only cool the oil better, but shed tranny heat as well. This should have a more overall cooling effect than other items.
Where I get hung up however is just how much contribution IATs are to the overheating situation. Is it the case that the engine gets hot and drives the turbos harder thus leading to heatsoak --> overheating? Or is it the case that the turbos work overtime due to their small size and huge demand under those situations, heat soak occurs, then IAT skyrockets leading to a hotter engine in a runaway cycle ---> overheating? The question is really which one is the greater driver of heat on the overall system. The engine pushing the turbos, or the turbos pushing the engine?
Now in my particular situation, my tranny does fine until the very limit of overheating, then it starts to climb. Clearly this is a byproduct of the overheat situation, not a driver. In those extreme pulling situations at elevation with high ambient temps, if I back off the pedal and downshift when engine temps are high, I get immediate cooling of the system. Like within seconds. This leads me to believe that heat soak of the intercooler is the main driver of the overheating situation. Could the radiator be better, sure. Could it shed more heat, faster, sure. But it doesn't seem to be the main driver of the overheat in my situation. I greatly appreciate your firsthand experience with the intercooler and radiator upgrades, but I have to ask, did you test just the intercooler by itself under those same circumstances with the stock radiator? What was the result?
I am thinking the drivers of heat are 60% intercooler, 40% radiator. (It may also change depending upon how the truck is being driven.) In all fairness, like you have done I plan on buying both eventually. I just want to know which one should I go for first. I see half the people on the F150 forums say intercooler, the other half say radiator/tranny cooler. Some say they still got hot with just the radiator upgrade, others say they got hot with just the intercooler upgrade. You have both, and your experience is showing some promise that this is at least a step in the right direction.
I wish someone would sell an "Ecoboost towing upgrade package" with Intercooler, radiator and tranny cooler at a discounted price (hint, hint). To be more bulletproof all three would really help IMO.