water level warning

I had this same problem and it ended up being sensor in the tank.

 

its the sensor,and i believe you cannot just bypass the sensor by connecting or disconnecting the wires to it.

 

I was having the same problem with a 1995 Kenworth t600 with a 12.7 Detroit engine the water level and the check engine light were coming on so I just disconnected the wire from the sensor. The water temp gages are showing fine so I will be replacing the sensor soon

 

Sensor or wiring right at the sensor plug are the 2 most common failures. Grab each wire and give it a good tug at the plug. If the wires are broken internally they'll pull apart, get harness repair end.

 

Here is one of many websites that sell harness repair kits.
Cromiance is the brand I bought from a dealer. Counter person said to order direct and save.
I searched the web and found this website
Automotive, Truck, Bus, and Off-Road Vehicle Connectors
good luck.

 

In my T660 there's a magnetic float in the tank. The sensor is in the shape of a rod and snaps into a tube that's actually the same tube that the magnetic float inside the tank floats up and down on.

Pull the sensor rod and touch the tip of it with a magnet, if the light goes off then it's not the sensor but the float instead.

I couldn't get it to float so I had to replace the whole coolant tank.

 

I bought 2 and then a week later bought the whole sensor and injector harness.
Just thought if the ends are going bad. I didn't want to be stuck with stop engine light beside the road in some mountain pass or worse downtown Chicago during rush hour.