I have a 2021 Ram 1500 Laramie, the last couple days the cooling fan is running high constantly. Whether I’m driving or idling at a stop light, the fan runs really high and loud. Any suggestions on the cause and the fix?
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Cooling fan running high
- Thread starter Bbais
- Start date
Darksteel165
Legendary member
Make sure you have anti-freeze so your engine doesn't overheat.
What Bdais said above! I just had this problem start out of the blue with my 2019 Limited with 70k. I had never noticed or heard the fan run before but it was loud and constant. I decided to take a shotgun approach to it and changed the engine temp sensor, the thermostat and noticed some of the sludge in the expansion tank(which is also mentioned in a lot of posts). I flushed the expansion tank and then decided to drain some of the radiator to see what came out the bottom end. It looked clean so I didn't do a complete flush. At this point when refilling the radiator, I figured that the system was short by about a whole gallon of antifreeze. Not sure where its going since 100% no leaks. Short story long, after all this, my issue went away. I suspect the low antifreeze had something to do with it. Other thing which has been discussed often is the constant smell of antifreeze at the front end when you get done driving but mine has been like that since day one. Good luck.
Cor300mx
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I would like to bump this. I have a 2020 Bighorn, and this just started last night. I did top off the coolant, all the temps in the cluster are nominal. If a coolant sensor was faulty, shouldn't the temp reading me off??
DEG
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It's not just high engine temps that will cause the fan to come on. In most cars, electric cooling fans will run anytime the A/C compressor is operating. I've read that Ram does this as well and I've also read that Ram electric fans are also programmed to come on during certain low speed conditions even with normal engine temps. I think the systems try to be more proactive than reactive.
In the winter, I'm pretty sure defrost mode uses the A/C compressor so it may turn on the fan even if the engine temperature is normal. Next time you notice the fan running with normal engine temp, try turning off all climate controls and see if the fan soon shuts off.
In the winter, I'm pretty sure defrost mode uses the A/C compressor so it may turn on the fan even if the engine temperature is normal. Next time you notice the fan running with normal engine temp, try turning off all climate controls and see if the fan soon shuts off.
