These new tanks have some kind of float built inside and they break after a few years. Diagnostic codes seem to indicate problems with the low coolant level sensor. All pull-offs are guaranteed to arrive in working condition. I own a 2007 Meridian 490 with Cummins QSB 5. In other cases they were used for very low hours in testing/engineering. Turn the ignition switch to the 'ON' position.
Thru out the week when I stop at a shipper for 5 mins the low coolant warning comes on and the water in the reservoir tank goes below the Max full line to under the sensor.Cummins 3824257 Coolant Level Pigtail Connector Aftermarket Replacement Cummins N14 Sensors. A coolant temperature sensor keeps your car running right. If I turn it off the coolant level rises back up to the fill line. Cummins coolant level sensor My best guess you be to find out how much resistance is in the level sensor when it's full and install a resistor in the circuit instead of the sensor.
