Alright. It’s been pretty well documented that I’ve been struggling with water temp issues on my truck to the point that I did this.
I took my first trip today loaded down through the mountains and I think it was a mixed bag. I’ve got plenty of fuel now. Truck runs good. It just runs really hot. I finally have a good temp gauge so I can really see exactly where we are. I got nervous at 240. I saw 250 a couple times just for a minute or two.
My sender is in the stock location which is the hottest point. The interesting thing is I have my stock sender in the back of the passenger head. So really I’m watching the hottest point and some indication of water temp coming from the radiator. Even at 250, the factor gauge in the head was never out of the normal range. I still have the overtemp light sensor in the head and it never came on. I think it is supposed to trip at 260?
Anyway, I don’t like it that hot at all. It’s definitely not heat soaking the radiator. The big fan is currently on a motorcraft thermal clutch. It is definitely engaging I can hear the belts starting to squeal and as soon as I top the mountain it falls like a rock all the way back to 190. Most of the time it runs between 200 and 225.
So there’s a couple things here. The fan is not coming on soon enough. It’s not coming on until the gauge is reading 235 or more. That’s just too late. Damage has already been done at that point. I know it’s coming on now because the Vbelts start screaming for mercy. So there’s that little problem too.
So I guess the question how hot is too hot? Sustained vs short periods?
I think my next step is going to be fitting the 6.4 clutch so I can bring it in sooner. Slightly longer term may be going serp belts to turn this monster fan.
Welcome your thoughts on any/all of this.
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I took my first trip today loaded down through the mountains and I think it was a mixed bag. I’ve got plenty of fuel now. Truck runs good. It just runs really hot. I finally have a good temp gauge so I can really see exactly where we are. I got nervous at 240. I saw 250 a couple times just for a minute or two.
My sender is in the stock location which is the hottest point. The interesting thing is I have my stock sender in the back of the passenger head. So really I’m watching the hottest point and some indication of water temp coming from the radiator. Even at 250, the factor gauge in the head was never out of the normal range. I still have the overtemp light sensor in the head and it never came on. I think it is supposed to trip at 260?
Anyway, I don’t like it that hot at all. It’s definitely not heat soaking the radiator. The big fan is currently on a motorcraft thermal clutch. It is definitely engaging I can hear the belts starting to squeal and as soon as I top the mountain it falls like a rock all the way back to 190. Most of the time it runs between 200 and 225.
So there’s a couple things here. The fan is not coming on soon enough. It’s not coming on until the gauge is reading 235 or more. That’s just too late. Damage has already been done at that point. I know it’s coming on now because the Vbelts start screaming for mercy. So there’s that little problem too.
So I guess the question how hot is too hot? Sustained vs short periods?
I think my next step is going to be fitting the 6.4 clutch so I can bring it in sooner. Slightly longer term may be going serp belts to turn this monster fan.
Welcome your thoughts on any/all of this.