2010 d485 low coolant level.

If the tank is still full an the low warning is shuting/down the eng. CK ELE. conn. at plug in on screw in sensor on tank, buy a new low coolant sensor drain tank again and replace and low coolant sensor.

 

I have also had problems with my coolant sensor.

 

There is a magnet in the surge tank. Might be sticking. Change the surge tank or try to jar it loose.

 

Hi Duramaxxed... thanks for that info. I have had similar problems to the original poster in this thread... When you say there's a magnet in the tank, is it on a float of some sort that is supposed to slide up and down around the level sensor, thereby showing the level of the coolant? If that's the case then I think I have my answer. Grateful if you would verify for me/us.

 

Just a thought did u burp the air from the system
If not u may have a vapor lock situation that causes your
Problem otherwise the low water sensor would be my guess

 

If it can help i can give you a trick, when this problem occur (low coolant level Warning even though the surge tank is full) after the coolant has been dropped for any reason. . .

Use a big rubber hammer and hit gently the surge tank in different way it works. . . .

The surge tank is built with a dry sensor, the wet float (contain a magnet ring) inside of the surge tank is sliding up and down on a 3/4 inch diameter plastic tube (who contain the dry sensor)
Sometimes some tacky deposit are build up at the bottom of the float stroke and when you drop the coolant the float stay trapped (by tacky stuff) at his lower stroke position and generate a low coolant code.

Also one day i opened up one surge tank with an hole saw to figure out the problem, there is some particule of white sand stuck between the inner bore of the float and the 3/4 diameter plastic tube inside of the surge tank. (The sand particule act like a wedge between the float and the plastic tube and the float cannot move.)
Also i notice this problem is more common if people use radiator stop leak,
Ben

 

Hi ! is this a 2012 0r later Cummins ISL diesel engine you have ? Is the lower coolant sensor plastic and beige in color with a molded 3 pin connector on the back ? If so, there is a stainless steel replacement for this device.