Radiator fan won’t turn off! 2018 Ram 1500 5.7
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Joined: Apr 2010
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From: Clayton MI
I’m trying to solve an issue where my truck temps just continue to climb while towing my camper (5k lbs) up some short steep grades here in northern AZ. It’s given me the warning (250 degrees I think) while towing. It’s quick to return to cooler temps when I stop or slow but I’m having to slow down to 40mph at 3k rpm. I understand the hemi runs hot and I understand if it climbs and maintains but it just keeps going even after slowing down. My thought was the electric fan isn’t kicking on at 220 however I have seen it kick on when using the AC so I know the low speed works. I saw that the 80amp fuse was missing and figured that was the issue but sounds like maybe not. Is it normal to have to slow down that much when towing what seems to be a rather lightweight trailer? I’m not trying to go 75 up the interstate but 40 seems pretty slow. Thank you so much for the information thus far. It’s greatly appreciated.
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Joined: Aug 2024
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From: Arizona
2021 1500 classic SLT 4x4 with 66k miles. Trailer fully loaded weighs 5k pounds. Ambient temps here in northern AZ in summer are 90-100.
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Joined: Apr 2010
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From: Clayton MI
Record Breaker
Joined: Feb 2015
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From: Iowa
Usually if it's a fan issue it won't cool down at slower speeds because less air is flowing through the radiator. Not knowing what the steep grades are like that you're towing up in this hot weather I can't really comment on if that is to be expected or not. My 2014 Ram has never run hot with me towing my 7k travel trailer, but I've also not done that on steep hills or frequently when over 90 degrees outside. My Ram also has the towing package with improved cooling, but that might be more for the transmission and oil than for the engine.
-Rod
-Rod