All of my research shows that the majority of the time it is not the sensor. The OAT coolant creates so much sludge and staining and other, whatever, in the reservoir that the magnetic connection between the sensor and the float is blocked so the float returns to the “low coolant” position. Changing the sensor does nothing because the pathway is still blocked. There’s a YT video showing how to test your sensor with a magnet to see if it is still good. Buying an OEM reservoir comes with a new sensor.
I may try disconnecting the bottom hose on the reservoir, draining it, and blasting the inside of the reservoir clean with a low pressure pressure washer and letting all of the debris wash out the bottom and seeing if that fixes it before I give RAM any more money for their incompetence.
My 2018 RAM 2500 with 144K miles just experienced the low coolant issue like everyone else’s trucks will eventually. This is just another piece of junk part in a long list of junk parts RAM is putting in their trucks and it’s really aggravating.
Add this to their airbag module under the center seat, the 68RFE valve body, and some of the other junk parts they use.
