2015 Ram 3500 with low coolant light stuck on

My low coolant light came on and the coolant level was fine. I replaced the whole reservoir here's hoe and why.

[@windirono5409]

Overtime you will get a bunch of crap in your coolant solder bloom other contaminants just wear and tear stuff that will eventually get introduced. This is a great video, especially showing and cutting open the old reservoir and showing people how it works with the float versus the sensor well done.I recommend every 200,000 miles not just doing a coolant flush, but getting some of the D scale fluid to run through with distilled water to try and remove as much sludge as you can. This is an eventuality, but maybe it might lessen the timeline before things seize up.

[@thewayidoit8895]

Perhaps 100k miles.

[@871jamie]

There’s really no reason to drain the coolant other than what’s in the reservoir. The hoses going to it are higher than the radiator so it won’t lose much, especially if you clamp off the lower reservoir hose with something like needle nose vice grips before removing it from the reservoir. Worked for me anyway and only lost what was in the reservoir. Just saying.

[@jamesbinfl]

That is a Piss poor place for the low coolant sensor.. Why not halfway up the side of the reservoir? The bottom will collect sludge and cause a false low coolant light..

[@spudth]

Yup, my truck was at about 375k miles. Doubt coolant was changed as proscribed.

[@user-jm3wr7pj5j]

My coolant tank looks just like yours at 240000. I'm replacing my tank today.

[@thewayidoit8895]

I'm happy I did it and hope my video stops people from buying the sensor only.

[@nickboucher7339]

After replacing my turbo actuator and refilling my system, my truck signaled the low coolant light as well. I removed the inner fender got the truck up the temp and tapped on the bottom of the reservoir with a small hammer and light went out.

[@thewayidoit8895]

Interesting. I just drove mine a few miles and it was out by the next day. Maybe the sensor was sticking down as I ended up replacing it.

[@southernyankee2167]

I flushed my heater core and added a coolant filtration system and how I’m dealing with the low coolant issue… but no loss of coolant. My assumption is I knocked enough crud loose and it settled in tank and fouled the magnet. Truck has 75K miles on the clock.

[@nickboucher7339]

@@southernyankee2167 honestly try what I said. I was at wits end also. It's a float. If you know it's not leaking or overheating, get it up to temp and tap on that thing. I promise it will work.

[@thewayidoit8895]

@@southernyankee2167 75k is barely broke in. Changing coolant maybe 5 years is good. The crud that is attracted to the magnet is super fine.