1995 white/GMC with Cummins n14

Change sensor or if it is a plastic tank it could be a bad tank. Can also re flash ecm and turn off coolant level sensor with new calibration number.

 

Or wiring to sensor.

 

The upper steel part of rad. crossover hose may have a bleeder to let air out of top, 1993 n14 had them?

 

Look on the plastic tank for a plug with usually 2 wires going to it. This sensor is simply a switch which is either turned on or off by presence of coolant, much like a light switch in your house. We don't know if it wants to see a closed position or an open position to think there is coolant so you have to simulate both conditions. First, try unplugging it, then turn key off, and back on. If buzzer gone, then that's the answer to temporarily stop it. If it doesn't, then try the other condition, which is a closed circuit. Unplug it, put a paper clip into the ends of the plug to join the two together and complete the circuit. Key off and back on. If buzzer gone, then there's your temporary solution. I had this sensor go on a Volvo with an N 14. In my case it was looking for the open or unplugged circuit. The only thing I didn't realize was the part about having to shut the engine off and then restart. Just realize that if you do this, the computer will no longer be monitoring coolant level, and you have to do it yourself until you get a new sensor, or a new tank with sensor in it.

 

If the unit was using DCA4 witch I really dislike the sensor can be just dirty remove it and wash it off, wipe it down,
Just a thought!

 

Only if you do not ck. the coolant level,and watch the temp and no harm.